Isobel Flemming, a vampire working with Katerina Petrova (now known as Katherine Pierce) and who also happened to be the mother of the second Petrova doppelgänger, was trying to find Klaus and ultimately succeeded by getting close to a member of his inner circle. Klaus found out what she was up to and compelled her to tell him what she knew. When he learned that she was working with Katherine and that the rumors about a doppelgänger in Mystic Falls were true, he decided to use her in a plan to capture Katherine, the moonstone and the new doppelgänger.

Along with Klaus' trusted warlock, Maddox, Isobel made Katherine believe that Klaus was willing to pardon her if she delivered the moonstone and the doppelgänger to him. While Katherine found the moonstone, Isobel helped Maddox capture her former husband, Alaric Saltzman. Katherine and Isobel then captured Elena at which point Isobel revealed her true colors and Maddox captured Katherine. He then ordered her to let Elena go since Klaus didn't need her yet. Maddox then transferred Klaus' spirit into Alaric's body so that he could spy on Elena and her friends.

In The Last Dance, Klaus interrogates Katherine for information about Elena and her friends and learns that a witch Bonnie Bennett could be a danger to him, so he decides to kill her. Still pretending to be Alaric, he attacks her at the 60's decade dance by compelling several students. Finally cornering Bonnie, he forces her to use enough power to kill her, until she apparently dies. He doesn't realize that she has faked her death to protect herself and Elena.

In Klaus, he has Maddox and his other minions, including Greta, bring his original body to him so that he can return to it. While they are doing so, he sets up a contingency plan by threatening Jenna's life. As Stefan stops him from killing Jenna, Klaus tells him that it would be easy for him to take his revenge if Elena tries to stop him from breaking the curse. At the same time, Elena learns from Elijah the true nature of the curse and why Klaus wants to break it. He is then released from Alaric's body and returned to his own by Maddox and Greta.

Klaus goes to the Mystic Grill to remind Damon not to do anything he will regret. Damon asks if he can postpone the ritual, but Klaus says he has everything he needs and the ritual will happen. He warns him not to screw it up if he wants to live. Klaus returns to Alaric's apartment and is immediately suspicious of Katherine. He compels her to tell him what she has been doing but, as she is taking vervain, she is able to lie.

He is still suspicious and 'compels' her to take off her bracelet, walk to the window and stand in the sunlight. In order to keep up the ruse, Katherine complies and screams in agony until Klaus, satisfied that she has been successfully compelled, permits her to save herself. He then says she needs to do something for him. When the full moon begins to emerge, Stefan and Elena arrive home but are confronted by Klaus, who tells Stefan that he had him all nervous and thought he might have done something stupid. Klaus asks if Elena is ready. Stefan put his arm in front of Elena and says "No". Klaus tells him there is no reason for him to die, and he and Elena leave for the ritual.

Klaus returns to Alaric's apartment and tells Katherine that Elena is with Greta. The door flings open and Damon tells Klaus to postpone the ritual, explaining that he rescued the werewolf and vampire and killed Maddox. Klaus tells him that he knew either Damon or Stefan would try to stop him and reveals that he always has a back-up plan. He shows Damon on a webcam that he has captured Jules. Damon asks if he has a back-up vampire and Klaus says he has got it covered, before darkness falls on Damon. Katherine wakes Damon up and tells him that Klaus has gone to begin the ritual. She admits that she had to do something so Klaus wouldn't realize she was on vervain, and reveals that Klaus made her call Jenna, pretending to be Elena, in order to lure her out of the house so Klaus could use her as the vampire sacrifice. Katherine explains that Klaus needed another vampire because Damon's blood was made impure by his werewolf bite.

Klaus appears at the quarry and begins the sacrifice by handing the moonstone over to Greta. Klaus walks over to Jules, who then tries to attack him but fails. Klaus rips out her heart then squeezes the blood into the spell. The sacrifice continues and Elena begs Klaus to let Jenna go, explaining that she doesn't have to die. Elena doesn't want to leave Jeremy without a family and points out that she did everything Klaus asked. However, Klaus realizes that Stefan has arrived and goes to speak to him on top of a cliff. Stefan tries to negotiate himself in exchange for Jenna's life.

Klaus and Stefan return to the women and Klaus asks Elena who she wants to save and who she wants to die. However, he soon reveals that she doesn't really have a choice and stakes Stefan in the back. He explains that he has other plans for Stefan and needs him alive. Greta removes the fire circle surrounding Jenna, who rushes over to attack Greta as a last-ditch attempt to thwart her. However, Klaus stabs Jenna, lies her down, and stakes her in the heart.

Klaus appears and tells Elena it's time, offering her his hand. She refuses it and walks past him to the sacrificial altar. Klaus thanks her, but she tells him to go to hell. He bites her neck and feeds from her until she falls onto the ground, lifeless. Klaus announces that he can "feel it happening" and begins to transform. Bonnie appears and throws him across the ground. Greta heads towards them, but Damon snaps her neck.

Bonnie continues to cast the spell with Klaus yelling to the top of his lungs in pain. As he is about to die, Elijah approaches him at which point Bonnie stops the spell. Klaus seems terrified as he sees his brother towering over him. Elijah punches through Klaus' rib cage to get to his heart, and Elijah says that this was for their family. Klaus then tells him that he didn't bury them at sea and that their bodies were safe and that Elijah would never find them without him. After some consideration, Elijah saves his brother without Stefan or Bonnie being able to stop him.

A few days later wakes he up in the forest with Elijah over him. Elijah gave him some clothes and asked him where the bodies of their family were. Klaus says that he will take him to them in time. Later they go to Alaric's apartment where they find Katherine and Stefan. Stefan tells Klaus that he needs his help for Damon, and knows Klaus has a cure for Damon's werewolf bite. Klaus suddenly daggers Elijah with the White Oak Ash Dagger seemingly for trying to kill him during the sacrifice, and then he runs towards Stefan and puts a wooden stake close to his heart. Stefan then tries to make a deal with him. Klaus will give him a cure for a werewolf bite and he will be at his mercy. He releases

Stefan, and then he bites Katherine and gives her his blood and tells Stefan that his blood is the cure. In exchange for the werewolf bite cure, he forces Stefan to drink human blood several times to awaken Stefan's ripper persona. In the end he tells Katherine to go and give Damon his blood. Later he and Stefan go to a warehouse where he puts Elijah's body in a coffin and tells some men to put him with the others. Klaus then tells Stefan he has a gift for him, and beckons to a human girl. He says he wants to be sure Stefan will honor their deal, and feeds on the girl. Klaus releases her, but as she begins to flee Stefan attacks and feeds on her until she dies. Satisfied, Klaus says now they can go.

Klaus and Stefan have spent the summer tracking a werewolf named Ray Sutton down the entire Eastern seaboard, leaving a trail of bodies behind them. They ultimately find Ray in Tennessee where Klaus has Stefan kill two more girls before they corner Ray in a bar. There, Klaus tells Ray that he is a hybrid and that he wants to create more.

He has Stefan torture Ray using darts tipped in wolfsbane to force Ray to reveal the location of his pack. At this time, Klaus' is warned that Damon Salvatore had gone to the house where they had killed two women. He decides to go and put Damon in his place but Stefan insists that he should go instead. Klaus lets him. He ends up getting the location of the pack from Ray, then he finds the location of Ray's pack and ends up feeding Sutton his blood before killing him in order to turn him into a hybrid.

In The Hybrid, Klaus and Stefan find Ray's werewolf pack in the woods. Klaus feeds each of them his blood and kills them, believing this will turn them into hybrids. When Ray bleeds from his eyes and continues to feel immense pain, Klaus suspects that something has gone wrong. Ray soon becomes rabid and flees the site. Stefan, on Klaus' orders, pursues Ray to stop him and ends up bitten. Klaus says he will cure the fatal bite if Stefan retrieves Ray. The other werewolves experience the same bleeding as Ray, and Klaus kills some of them while others simply bleed to death. When Stefan comes back with Ray's dead body, Klaus is angry that he seems unable to successfully create a hybrid. Klaus gives Stefan his blood to cure the bite and they leave the campsite littered with the bodies of the failed hybrids.

In The End of the Affair, Klaus and Stefan have arrived in Chicago, where Klaus plans to meet his "favorite witch", Gloria, to find out why he can't make any new hybrids. Stefan finds an old picture of them together at the bar, and Klaus reveals that they had met before, that they had been friends back in the 1920s and that Klaus was Stefan's "number one fan", as he liked Stefan's ways of torturing others before killing them. Klaus had erased Stefan's memories of him and his sister Rebekah to protect themselves, as they were on the run from a yet unknown person. Gloria tells them that she needs Rebekah, as she has something Gloria needs. Klaus resurrects his sister, but she does not have her necklace, which they need in order to contact the Original Witch.

In Disturbing Behavior, Klaus is still using Gloria to try and find the necklace. Klaus later finds out that Stefan was asking about Mikael, the person that he was maybe running from in the 1920s. Klaus seems angered by this and knocks Stefan out then takes him back to Mystic falls to find out why he is still holding on to his former life.

At the beginning of The Reckoning, Klaus corners Elena, asking her why she is still alive. He takes her by the arm and leads her to the gym, chasing away the other students by telling them they've been busted for pranking. Elena tells Klaus not to hurt anyone, but he argues that he has to. Rebekah drags Tyler's body into the gym, and they wait till Bonnie arrives, where Klaus tells her she has to find a way that he can successfully create hybrids.

Stefan later comes in and pledges allegiance to Klaus, but both knew it was a lie as soon as Klaus hurt Elena, and Stefan tried to stop him. Klaus then compels Stefan not to fight him and to listen to him. He orders him to kill the two teenagers, Dana and Chad, whom Klaus had compelled to stay there. To make a game of everything, Klaus sets the gym clock as a countdown: Bonnie has to find a way for him to create hybrids, or else Stefan must kill Elena when time is up.

After Stefan tries to fight the compulsion, Klaus yet again compels him, this time much more emphatically, to turn his humanity off, and finally succeeds. Having overheard Matt tell Bonnie that the witches on the Other Side said the doppelgänger must be killed in order for the hybrids to survive, Klaus surmises that the opposite must be true - that the doppelgänger's blood is necessary to complete the process. He turns out to be right after he feeds Tyler a vial of Elena's blood and Tyler completes the transformation - the first hybrid after Klaus.

Damon arrives to rescue Elena at the hospital, where Klaus has hooked her up to a blood bag to extract her valuable blood. Klaus stops him in the parking lot, saying although he had promised Stefan he wouldn't kill him, now Stefan probably wouldn't care. Damon tells him that Mikael knows where they are. Klaus replies that he's bluffing, but Damon informs him that they found Mikael's tomb. Klaus throws Damon against a car and vanishes without a trace. He leaves town in search of werewolves he can turn into hybrids, and manages to find several, successfully turning them.

In Homecoming, Klaus receives a call from Stefan who tells him that Mikael is dead. Thanks to the fact that Elena really did stab Mikael with a white oak dagger, Stefan is able to override Klaus' compulsion when he is forced to tell the truth. Rebekah, who has learned that Klaus had killed their mother, corroborates Stefan's lie in an attempt to lure him back to Mystic Falls. Klaus says that he will be on his way. In the meantime, he gives Tyler orders to throw a party to celebrate Mikael's death.

After seeing who he thinks is Elena, he reveals that his hybrids are present throughout the crowd, and they have orders to kill Damon if Klaus is killed. The party goes well, until one of his hybrids says that a guest named Mikael is waiting for him. Visibly angered, he goes to meet his step-father at the door. Klaus attempts to have his hybrids attack Mikael, but Mikael reveals that while they are sired to Klaus, they are part vampire and can therefore be compelled by Mikael, an Original. Mikael reveals that he had one of the hybrids grab 'Elena' and threatens to kill her if Klaus doesn't come outside of the Lockwood house.

Klaus tries to call Mikael's bluff, but Mikael stabs her. To everyone's shock, it isn't Elena at all, but Katherine, who throws wolfsbane grenades at the hybrids and runs. Damon then appears and attacks Klaus with the white oak stake. However, Stefan interrupts the battle, pulling Damon off of Klaus. Klaus grabs the stake and drives it through Mikael's heart, killing him and destroying the stake in the process.

When Damon asks Stefan what he was doing, it is Klaus who answers by saying that Stefan was earning his freedom, which Klaus then grants him before leaving again. Unaware of his sister's role in the murder attempt, he calls to tell her that Mikael is dead and that it is time to go, but he is unable to reach her (Elena had daggered her before the homecoming dance). Stefan then calls and reveals that he had stolen the coffins containing Klaus' siblings, whom Klaus intended to revive now that Mikael was dead. Klaus threatens to kill Stefan and anyone Stefan ever met, but Stefan merely replies that if he does, he will never see his family again.

In The New Deal, Klaus is having a house renovated for himself and his hybrids to live in while in Mystic Falls. He meets Damon and Elena at the Grill asking where Stefan is. When they don't cooperate, he leaves, hinting that Stefan's whereabouts might soon be their problem as well as his. Later, while discussing his predicament with Damon, Klaus calls Jeremy and tells him to do "that thing" he'd told him to - clearly Klaus had compelled him earlier that day to wait for and obey his instructions to go outside into the street and not to move. Klaus' hybrid attempts to kill Jeremy by hitting him with a car, but Alaric saves him. Once back at his house, Klaus chats with Tyler about the day's events, mentioning that humans are a means to an end. Later he arrives at the Salvatore Boarding House to meet Elena, who leads him to the cellar where Rebekah lies daggered. Elena uses Rebekah as a bargaining chip in exchange for sparing Jeremy, but Klaus reminds her that he has plenty of ways to get what he wants, including hurting other people she loves. Before she leaves the cellar, Elena reveals that she told Rebekah about how Klaus was the one who killed their mother, not Mikael. Having returned to his mansion with Rebekah, he re-daggers her before she can revive, and returns her to her coffin rather than face her wrath for his betrayal.

In Our Town, Stefan visits Klaus and tells him to get his hybrids out of the town. When he doesn't agree, Stefan kills Mindy by decapitating her. Klaus is angry and tells Tyler to bite Caroline but he refuses. Later, Klaus attends the Founder's Council Feast and persuades the Mayor that his hybrids would protect the town. Damon tries to call Elena and Stefan answers; worried about what Elena has to do with Stefan's plans, he tries to convince Klaus Stefan means business. Stefan calls Klaus and threatens to take away his "blood source" by driving Elena off of Wickery Bridge. To prove his point, Stefan forces Elena to drink his blood. Hearing this and Elena pleading with Stefan to slow down, Klaus finally promises to get his hybrids out of Mystic Falls.

After Tyler unwillingly follows Klaus' orders and bites Caroline, he goes to Klaus asking him for help. Klaus goes to the Forbes house to heal Caroline. Liz invites him in and he has a intimate conversation with Caroline about being immortal. Eventually, he feeds Caroline his bloods and says "Happy Birthday". After Caroline wakes up the next morning, Klaus has left but she finds an expensive bracelet made of dozens of diamonds: a gift from Klaus.

In The Ties That Bind, Klaus appears in one of Bonnie's dreams as she tries to open the locked coffin. Back in present time Stefan comes home and finds Klaus there, "enjoying" their stalemate. Klaus repeats his demand that Stefan return his family, now that his hybrids left town. It is revealed that he ordered Daniel Warren, a hybrid, to go to the house of Abby Bennett and handle the situation, which he does by manipulating Abby and her foster son Jamie in order to get Bonnie to reveal the location of the coffins.

Later, after Bonnie finally divulges the location, Klaus arrives at the Abandoned Cottage to find Damon there. After insulting them, the witch spirits torture Klaus until he pushes back by threatening to end the Bennett line. He then commands them to show him the coffins and they do - except the fourth one is missing. He asks Damon where the last one is and he threatens to rip out his heart, but Damon reminds him that the fourth coffin is leverage and Klaus wouldn't kill the person that knows where it is. After the other coffins were moved to his house, Klaus is surprised by Elijah, un-daggered earlier by Damon, standing in front of him after killing a hybrid.

In Bringing Out The Dead, Elijah attacks Klaus for having daggered him but Klaus overpowers him and, having pulled the dagger out of their brother Kol, threatens to use it on him. Elijah retorts that he would have to deal with Kol then. Klaus resigns himself to that fact and tells Elijah that Mikael was dead. Surprised to hear of their father's death, Elijah asks why their family remains in the coffins. Klaus asks Elijah to help him get the fourth coffin back from Stefan by reminding him of the oath that they had sworn to one another: 'always and forever'. Elijah then organizes a dinner, inviting Stefan and Damon. The brothers offer the deal that, in exchange for the coffin, Klaus will leave Mystic Falls forever, a deal that Elijah deems to be fair.

Klaus later counters with his own offer: Elena's future happiness with a human husband, in exchange for the coffin; this would keep her safe from what he deemed to be a dangerous feud between the Salvatore brothers, and would ensure the continuity of the Petrova bloodline so that he could keep creating hybrids. Stefan refuses the deal. Klaus then grabs him and burns his hand in the flames while Elijah prevents Damon from intervening. Klaus tells Damon to bring him the coffin or he will kill Stefan. Damon complies and Klaus sends Elijah with him. However, Elijah and Damon return soon afterwards, not with the coffin but with the daggers that Elijah had removed from the other Original siblings.

Elijah claims to have learned not to trust Klaus' promises and declares that this will be done on his terms. Kol then appears, followed by Finn, who stabs Klaus in the hand after he tries to seize the dagger. As Klaus tries to run, Rebekah appears and stabs him, saying "This is for our mother". Klaus stumbles back and is caught by Kol. Elijah dismisses Damon and Stefan. Rebekah announces that they are all leaving him. Suddenly Esther walks in the door and tells her children to stop fighting. She tells Klaus to look at her and asks if he knows why she is there. When Klaus suggests that she is probably there to kill him, she says she is there to forgive him, and that she wants them all to be a family again.

In Dangerous Liaisons, Esther organizes a ball to celebrate the reunion of their family and asks Klaus who he is going to bring to the event. Klaus decides to send a ball dress as a present to Caroline, along with the invitation and a note to save him a dance. She arrives that evening wearing the dress and the bracelet he had given her for her birthday. She dances the waltz with him while he asks her how she's been doing since her father died, tells her how beautiful she looks in the dress he gave her, and compliments her dancing skills.

Klaus later approaches Caroline outside, where she is admiring a horse. Klaus confides that the closest Mikael ever got to killing him was the time he killed Klaus' favorite horse as a warning. Caroline asks whether he had ever thought to talk it out with his father, but Klaus insists his relationship with his father was far more complex than her relationship with hers. She allows this, but changes the subject as an excuse to go inside. Later, Klaus shows Caroline his private art collection. He tells her about his own work and asks if she has been to the Hermitage. When she admits she hasn't really been anywhere like that, he promises to take her anywhere she wants. Caroline chastises Klaus for his extravagance, positing that he wants to create hybrids to be his servants. He deflects her demand that he set Tyler free. She then blames his obsession with creating hybrids and giving expensive gifts on what she thinks is his belief that no one could love him otherwise. Angered, she leaves him alone in the room. At home, Caroline finds a drawing of her with a horse, as well as a note from Klaus thanking her for her honesty.

In All My Children, Klaus is with Kol in the house. Rebekah comes home from her one night stand while Klaus sits sketching. Kol says he's bored so he and Klaus leave the room. They head to the Grill where they meet Alaric and Meredith Fell. As a distraction, planned by Damon, Caroline enters the pub but seems displeased to see Klaus and immediately leaves. He follows her outside and dares her to get to know him. They sit together on a bench and talk. Later, after Kol gets neutralized, Klaus feels something in his chest and recognizes something must have happened.

He rushes to find Kol, pulls the dagger out and threatens to kill the Salvatores, but Elijah stops him. Together with Kol and Elijah he goes to the Witch Burial Ground, where Esther is performing a spell to kill her children. Klaus orders her to end this or he'll send her back to hell. She responds that she has hated to see how they all shed blood throughout the centuries. After the spell is interrupted thanks to the Salvatores, Esther disappears with Finn. Later, Klaus is burning the pictures he had drawn of Caroline when Rebekah joins him. She says she had hated him when she found out that he killed their mother, but Klaus is the only one who has never left her. She then delivers the shocking news that a sapling of a white oak tree had been planted 300 years after they left the Old World.

In The Murder of One, Klaus and Rebekah join forces to get Finn on their side by reuniting him with Sage. He then gets Bonnie to undo Esther's linking spell. He first tries to bribe Bonnie by offering to reunite her with her mother, but when Bonnie refuses, he instead threatens to kill Jeremy. Klaus watches as Rebekah tortures Damon, but they stop when Stefan comes by and offers to trade his white oak stakes for Damon's freedom. Klaus then learns that there are more white oak stakes and that one of them was used to kill Finn.

In Heart of Darkness, Klaus wants to get the last remaining white oak stake, and sends Kol to stop Damon and Elena from learning of their bloodline origin. He gets impatient waiting for Alaric's alter-ego to fess up and eventually kills him to speed up the process. Later, once Alaric had divulged its location to Stefan, Klaus sends Rebekah with Alaric to retrieve it, not knowing that Rebekah is possessed by Esther.

In Do Not Go Gentle, Esther, while possessing Rebekah, convinces Klaus to go the 1920s dance by telling him that Caroline will be there. At the dance Klaus sees Caroline and Tyler dancing and he interrupts them by asking Tyler where he's been. He then asks Caroline to dance; at first she refuses him, but then Tyler says it's all right. While dancing, Klaus tells her how she would have loved the 1920s and that he will be leaving Mystic Falls that night. After Klaus tries calling Rebekah, Stefan informs him that Esther is back.

After Esther is killed, Klaus states angrily that Esther will never be able to stop him and that he will continue to live. In Before Sunset, Klaus is informed by Rebekah that Alaric survived, and that the white oak stake has no effect on him. Rebekah wishes to leave, but Klaus states that he will not leave without Elena, causing Rebekah to get angry and state that she won't care even if he does die, before leaving. Klaus then goes to Elena's house to collect her, however Stefan and Damon bar his way. He begins attacking the house from the outside, trying to force them to invite him in, but they manage to repel him. Just as he is about to cause the place to explode, Stefan comes out and says that Alaric has captured both Elena and Caroline and will only give them up if Klaus hands himself over. Klaus initially refuse, but Bonnie comes up with a plan that will allow them to actually succeed. He then agrees, but makes it clear that after this he is taking Elena and leaving. He waits in front of the school-where Alaric has Caroline and Elena-with Stefan and the two talk, Klaus trying to drive a wedge between the brothers again.

When Stefan states that all of Klaus' attempts to break the Salvatore brothers apart has only made their bond stronger, Klaus counters by asking what will happen when Elena finally chooses between them. Then, Bonnie, Damon and Jeremy show up. Bonnie gives the vampires a vial of her blood, saying that once they drink it, all they have to do is make a connection with Alaric's heart, and she will use her magic to stop it, effectively neutralized him. After drinking the blood, Klaus enters the school with the Salvatores.

He comes across Caroline and grabs her, keeping her quiet and telling her that she will be fine, and that she must get home as soon as possible, she thanks him then runs. Stefan and Damon restrain Alaric, and Klaus plunges his fingers into his heart, but Alaric manages to get free, break Stefan and Damon's necks and nearly drove his white oak stake through Klaus' heart. Ironically, Elena saved Klaus by threatening to kill herself, deducing that Esther bound Alaric's life to hers so that he could only live one life time. As she prepared to follow through with her threat Alaric went to stop her, freeing Klaus, who then ran off with her.

He then began draining Elena of all her blood, that way gaining enough blood to at least have some hybrids, while also killing off the greatest threat to him. When Elena asks why he is killing her, as he won't have an unlimited army anymore, he states that he doesn't need one as he has his family back. Elena counters saying that they will never truly trust him again, and that he is wants a back up family, which is why he is draining her blood instead of simply snapping her neck. Later, Tyler shows up and tries to free her, but Klaus finds him before he can get Elena out of the house.

He asks how Tyler broke the sire bond, and Klaus states that that is impossible, Tyler countering by saying that true love is more important than sire bond induced loyalty. Klaus states that Tyler should be thanking him as he saved Tyler from the misery of life as a werewolf, but Tyler says that Klaus doesn't give a crap about him, he only wanted to not be alone. Klaus then prepares to kill him, but Stefan and Damon arrive. Tyler and Damon restrain Klaus, while Stefan plunges his hand into Klaus' chest, and Bonnie begins her spell again. Klaus looks at Stefan with a mixture of sadness and shock as his life fades away. He is then completely desiccated , and his dead body falls to the floor. Everyone then holds a victory party, and Stefan and Damon later drive off with the purpose of disposing of Klaus' corpse.

In The Departed, Damon stores Klaus' coffin in a warehouse outside of Mystic Falls. Bonnie arrives at the warehouse, and Damon tells her that he hid Klaus' coffin in compartment 1020, saying that compartment 666 would be too obvious (666 is the Devil's number, with Damon indicating that Klaus is the Devil). Bonnie and Damon enter the compartment, and open Klaus' coffin. Klaus wakes up from his sleep, but is still in a dessicated state. Bonnie then asks Damon to give her a moment alone with Klaus, saying that she wants to appreciate the sight of him like this. After Damon leaves, Bonnie tells him that he should burn in hell.

However, she knows that if he dies, so does her mother and friends, and she questions him what she is supposed to do about that. Off-screen, Bonnie saves Klaus from Alaric by performing a spell that transferred his spirit into Tyler Lockwood's body and possibly preserve his physical form. Later, Alaric shows up at the warehouse, catching Damon off guard. He demands to know Klaus' location, and Damon tells him that he stored in one of the compartments. Rebekah later shows up to retrieve Klaus' coffin. Rebekah and Damon try to sneak Klaus out of the warehouse, but are caught by Alaric. Alaric slams Rebekah against the car and tosses her aside. Damon tries to stop Alaric from opening Klaus' coffin, but fails. Alaric does so, and brandishing the White Oak Stake, plunges the weapon into Klaus' heart. Klaus gasps in pain and bursts into flames, Rebekah screaming in horror. Damon gives Rebekah time to escape Alaric.

Afterward you see Bonnie talking to Tyler and realize she put a spell on him to transition his "soul" in with Tyler. He tells her that she did the spell brilliantly and he didn't think she had it in her as she tells him she did it to protect her friends and her mother.

In the season premiere, Growing Pains, Klaus, still in Tyler's body, is still in hiding. Bonnie tells him that their agreement was for him to jump into another body, however Klaus learning that his body is still intact, he wants her to put him back in his body. Bonnie tells him she can't right away as she has to use her magic to attempt to bring Elena back to life. Klaus informs her that Elena is no longer his concern, but is convinced to let Bonnie try to save Elena in order to keep the Petrova Doppelgänger bloodline alive. While waiting, Mrs. Lockwood calls on Tyler's phone and informs Klaus of Caroline being taken. He rescues Caroline, but leaves Rebekah, to "keep them busy" calling her little sister, revealing that he is really Klaus.

After escaping Caroline is happy to see that Tyler is still alive and the two begin making out, however Klaus calls her "love" which leads Caroline to realize that it is really Klaus. They find Bonnie to complete the spell and while she originally refuses to use the dark magic needed, Klaus begins ripping Tyler's heart out, forcing Bonnie to do the spell.

Later that night, now back in his body, he returns to his home to get the last of Elena's blood, when Rebekah arrives upset that he saved Caroline, but not her. Rebekah upset over his betrayal and her realization that he will always choose his hybrids over her, destroys the blood bags. He grabs her and tells her that they are no longer family, he snaps her neck and leaves her on the floor unconscious.

In The Rager, Carol Lockwood calls Klaus and his last remaining hybrids back to Mystic Falls to serve as protection for Tyler. Although Klaus no longer cares, he isn't willing to let one of the few hybrids he has left die. He later meets Hayley, a werewolf who helped Tyler overcome his sire-bond, and discovers that Tyler has been keeping things from Caroline, thinking Tyler had an affair with Hayley while she helped him break the sire-bond. He joins Damon in the trapping and interrogation of Connor Jordan, where he discovers that Connor is part of a mysterious group of vampire hunters known as the Five. He then saves Connor from the explosion and also saves Elena from the werewolf venom she had drunk, claiming that she could be of some use to him after all.

In The Five, Klaus is first seen in the Mystic Grill when Rebekah was flirting on Matt and he told her she was trying to hard. He tried to get her to work with him after he told her that the Brotherhood of the Five still existed, but she was still mad at him for what had happened. He was later seen talking to Connor, who was tied up in his mansion, asking him for information. When Stefan entered, Klaus started telling him about the past. He remembers he was in Italy talking to his brother Elijah, when Alexander, one of the Five, showed in front of everyone a vampire, killing him by exposing him to sunlight, but Klaus didn't feel threatened by him. He later convinced Stefan to get Rebekah to his mansion, which he did. The three of them were having dinner when Klaus and Rebekah continue telling Stefan of when Alexander and the other members of the Five, who originally owned the White Oak Ash Daggers, daggered all of the siblings, but due to Klaus' werewolf side, it didn't work on him.

He killed all of the Five and undaggered his siblings, except for Finn. They told Stefan about the existence of The Cure, and Klaus said that the Hunter's Mark tattoo on Connor was going to lead them to it. He brought in Jeremy and ordered him to draw Connor's tattoo since he was the only one who saw it. Then Rebekah got angry after Klaus tells her he still didn't trust her and left. When Klaus later sees Jeremy drawing of the tattoo, he gets angry because Jeremy didn't do all of it, but he tells him that it grew each time he killed a vampire, and it wasn't complete yet. He then calls in Nate, one of his hybrids, and tells him to tell the girl to take Jeremy home and told Nate to make sure Connor stayed there and alive. Finally, he was seen again when Rebekah went to the Salvatore Boarding House to talk to Stefan, and he calls Rebekah a hopeless fool for loving too much, and daggers her.

In The Killer, Klaus was in Italy digging up Alexander's sword. He was first seen when Stefan was talking to him on the phone, telling him that Connor had escaped. He pointed out that Connor had werewolf venom, and since he was halfway arounf the world, he couldn't cure anyone since they had no access to his blood. He orders Stefan to make sure that Connor is kept alive at all cost, and also warned him to not tell Damon about The Cure.

He was later seen again when they had managed to find the sword. Tyler calls him and tells him that sending Dean to confront Connor was a suicide mission and that he should stop him, but Klaus threatened to tell Caroline about what he thought that Tyler had done with Hayley, so Tyler hung up and told Dean he could do it.

In We All Go A Little Mad Sometimes, Klaus was seen at the Lockwood Mansion along with his Hybrids, drinking in honor of Dean’s death. Then after Caroline came to return all of Tyler's things and broke up with Tyler in front of him, he left the place with his hybrids to give them time alone. But as soon he left, it was revealed that Caroline, Hayley and Tyler faked it. Meanwhile, Klaus called Stefan and taunted him about ruining his plans for a hybrid filled future and asked him how Elena was doing with her hallucinations. Stefan asked him how he knew about that, and Klaus reminded Stefan that he had killed the original members of The Five, so he knew about it. Then he asked Stefan where he was. Stefan said he was at Elena's place. Klaus also came there and Stefan came out to talk to him. Klaus suggested for Stefan to hand over Elena, or else she'll kill herself before the end of the day. Meanwhile, Elena was hallucinating again and fled from the house, and Klaus took that opportunity to carry her away. Then Klaus put Elena in a windowless room. He said it was for her protection else she would take off her daylight ring and burn herself to death.

When Elena said she would never do that Klaus told her she would want to kill herself as he had once and he had to bear the torture for nearly 52 years. But when she asked him how he stopped it and he said it stopped on it's own. Later, according to Stefan’s plan to rescue Elena from Klaus, Caroline came to distract Klaus when he was drinking at the Mystic Grill. Klaus offered Caroline a drink and asked her about the break up, but she brushed him off saying that wasn't his business. Then Klaus said that he would never allow Tyler to hurt her if Tyler was sired to him. Stefan texted everything to Caroline after losing Elena again. Caroline then confessed to Klaus what she was really doing and told him that they figured out a way to end the Hunter's Curse. Then Klaus arrived at the Lockwood Mansion when Chris was about to leave. He let Jeremy kill Chris, and the Hunter's Curse was broken. Later it was revealed that Klaus gave up one hybrid, (Chris), after Caroline agreed to go on a date with him.

In My Brother’s Keeper, Klaus was first seen when Stefan was in the woods alone and Klaus came up behind him and threatened him for telling Damon about the Cure. He ordered him to help Jeremy complete his Hunter's Mark, or he would give him up as a victim himself to Jeremy. He was later seen when Caroline was organizing the Miss Mystic Falls Ceremony and he asked her at what time he should pick her up for their date to following day. When she refused the date, he reminded her that he was promised a date in return of one of his hybrids, so she had to agree. He was later seen at the pageant when Caroline was complaining about how the ceremony was going when he came up to her and asked how he was, and she said perfect, despite him being so annoying that she can't even look at him. He pointed out that Tyler and Hayley where there together, leaving her confused.

He was later seen when Caroline and Elena were arguing and he came to stop Caroline because she was making a scene, and he told her to go with him to have some champagne. They were on a bench together and they were talking about being human, and when Caroline asked Klaus if he wanted to be human, he asked why he would rather be human instead of being one of the most powerful creatures on earth. Then, he started joking with Caroline, reading out her previous Miss Mystic Falls application, and she was trying to stop him. They were laughing together. Later, he came up to Caroline and told her that he once wanted to be a human. He had seen a hummingbird, with it's heart pattering like a machine gun, and he realised how beautiful it was to work hard every day to survive and the feeling of satisfaction every day for surviving.

In O Come, All Ye Faithful, Klaus was first seen in his mansion drawing a painting of a giant snowflake to donate for the Winter Wonderland charity event and later told Adrian to take it to the Mystic Grill. Stefan came up to him and asked him about when they were going to find the cure, and he told him that he had done his part by finding the sword, now Stefan had to do his part by helping Jeremy complete his mark. Stefan told him that he didn't trust him about finding his sword, so Klaus showed it to him from the safe. He was later seen in the Mystic Grill when Caroline was looking at his painting and he came up to her to talk to her. He said she liked his painting, and he then offered to have some champagne together. At first she refused, but then she agreed, and asked her if that was their thing (having champagne together) and she replied they didn't have thing. It was shown that Tyler was planning to put Klaus in his body and then they would him in concrete. Hayley said that she had found the witch to perform to spell. They wanted to get rid of Klaus. Later, the plan had changed to put Klaus in Rebekah's daggered body. Klaus was later seen at night at the party when Stefan came up to him. He told him that he had broken in his mansion to find the sword, which he didn't, but instead he found his victims' letters, which he replied that it was his way of keeping a reminder that in the end we’re left infinitely and utterly alone, which was like his way of writing his victims' names on the wall. Klaus saw Adrian and left with him.

He was later seen when Kimberley and the other hybrids were waiting for the witch, and Klaus showed up with Adrian and pulled his heart out. He started killing all the hybrids with the hunter's sword, and the last one left was Kimberley. She tried to run away in the Lockwood Cellar, but he followed her and asked her if she knew where Tyler was. She said that she didn't, and so he killed her by decapitation. It was revealed that Hayley didn't really have a witch, and she wanted Klaus the kill the 12 hybrids for the sacrifice.

At the last scene of the episode, Carol was the last one left at the party and was waiting for Tyler to pick her up. She sat down on the fountain, and Klaus came up to her, telling her that he was also looking for Tyler to have a word with him. Carol begged him not to hurt Tyler since he was her son and the only thing she had. He told her that she was also all that he had, and it was a beautiful symmetry. So, he grabbed her and drowned her in the fountain, killing her.

In After School Special, Klaus visited the lake house to check up on Jeremy's progress in growing his mark only to find that he hadn't killed any vampires since he was too busy being trained by Damon. Klaus chastised Damon for this, saying that there was a whole town of people he could turn into vampires that Jeremy could kill but Damon wanted to make sure Jeremy was all trained up before he began. Klaus managed to convince Damon that his way would be the most efficient and then proceeded to turn all of the townspeople, enjoying a quiet drink while the entire town was starting to transition.

In Catch Me If You Can, we returned to the bar where Klaus had massacred those innocents so Jeremy could kill them all after they'd transitioned and grow his mark.. Elena went to see Klaus to beg him to call off Kol. She convinced him that they were all on the same team to a point -- Team Cure Should Be Found. They only differed on how to use it. So Klaus called Kol and told him to stay away from Jeremy, and if causes any more trouble, he'd end up back in a box. Kol agreed that he wouldn't touch Jeremy but compelled Damon to kill Jeremy. Later, Klaus saved Rebekah from Kol almost killing her. Which shows that he still cares about his little sister. We also had to see Klaus come to Elena's to demand he house Jeremy now that Kol will undoubtedly come after him again. Elena and Jeremy opted for Jeremy to stay at their house, where at least Kol couldn't get in but he noted that his brother could burn it down. Klaus told Elena to tell when Kol returns, and he told Jeremy there was no shortage of people to turn or loved ones to threaten, so they'd finish their work on the mark the next day.

In A View To A Kill, Klaus comes to Rebekah's house to momentarily unite their teams against Kol, who now has the white oak stake as well as Klaus’ set of daggers. Klaus knew Rebekah has the last dagger and some white ash, and he wanted it so he could put Kol back in a box. Rebekah didn’t want to leave herself unprotected, so she told Klaus to get gone. Klaus asked Stefan to talk some sense into her: If they dagger Kol, Damon will no longer be compelled to kill Jeremy, and the hunt for the cure could continue.

Stefan apparently agreed to the Original's proposal, but only on the condition that he takes Stefan's place as Damon's "babysitter" at the Salvatore House while Stefan tries to persuade Rebekah. He is later seen with Stefan visiting Damon at his confinement.

Stefan told Klaus to give Damon a vial of blood every couple of hours so he doesn’t desiccate. He gave him permission to bleed him out again, if needed. Damon told Klaus that Stefan was still mad at him for sleeping with Elena, and Klaus told Damon about catching Stefan sneaking out of Rebekah’s bed. Klaus was inside the cellar with Damon villain-bonding. Klaus asked Damon how he gets Elena to overlook every horrible thing he’s done: “What is it you say to her?”Damon knew what this was about: Klaus is afraid Caroline won’t forgive him for killing Carol Lockwood. Damon gave him a real answer: Damon is the bad guy so things get done, Klaus is a bad guy just to be a dick. “If you’re gonna be bad, be bad with purpose; otherwise, you’re just not worth forgiving.”

Damon and Klaus, the latter of whom was infuriated by Stefan’s lack of communication. “It’s one of his trademarks, like his brooding and his hair,” Damon said. Klaus entertained himself trying to wind Damon up. He pointed out how Stefan had fought so hard to fight Klaus' compulsion to feed on Elena that he was able to momentarily beat it. Whereas Damon couldn’t resist Kol’s to kill Jeremy. Damon may love Elena, Klaus said, but will Elena see that Stefan is the greater love when they find the cure? Klaus thinks that’s what’ll happen, and he believes Damon does, too. Kol called Klaus at that moment. He assumed that Klaus was in on this plan to kill him. Klaus, meanwhile, freaked out and asked Damon what Stefan and Elena were planning. Damon genuinely didn’t know. Klaus thought he’d compelled Damon to stay in the cellar, but Damon had been drinking that bottled water Stefan gave him, which had vervain in it.

When Jeremy staked Kol, Klaus had shown up, just in time to see Kol ablaze. He had tears and anger in his eyes. Elena tried to play it off like they had no choice, but Klaus knew they’d set a trap for Kol if he was even inside the house. He said he was going to set the house on fire and kill them when they fled. Jeremy said Klaus would never get the cure then for Elena to make more hybrids. Klaus let something slip: He didn’t want the cure so he could make hybrids. He wanted it so he could destroy it. He was going to kill them all as soon as he found it. Before he could make good on his arson threat, Bonnie showed up. She crippled him, then told Jeremy to invite him in. She put up magical barriers to keep Klaus trapped there.

In Into the Wild, Klaus was still trapped in the Gilbert house, forced to stare at his little brother's charred body. Tyler showed up, still furious with Klaus for killing his mother. He was gloating, telling Klaus that the others would find the cure and when they did, Tyler was going to shove it down Klaus' throat and kill him in whatever way he pleased. Klaus told him that he couldn't be sure that he wouldn't die too, since he was part of his bloodline but Tyler seemed certain that once Klaus was human again, all the vampires in his bloodline would no longer be connected to him. Caroline arrived and after chastising Tyler for baiting Klaus, covered Kol's body with a tarp, relieving Klaus of having to look at his brother's body. When Caroline showed Klaus that she had now given up on him, not feeling sorry at all for him, Klaus struck quickly, pulling her up to him before biting her. His hybrid bite was fatal too her so she hastily began developing symptoms and slowly dying. Klaus told Tyler that he wanted an apology for turning his hybrids and on him and after some deliberation, Tyler did so but Klaus still didn't heal Caroline. It was only after she told him that she knew there was still a bit of humanity in him that Klaus reconsidered and healed Caroline.

In Down the Rabbit Hole, Klaus remained stuck behind Bonnie's barriers while Caroline was on the phone with Elena, trying to figure out where the sword was. Caroline and Tyler, knowing Klaus wouldn't be going anywhere, found the sword at his house and brought it back to the Gilbert's. They found secret messages beneath the hilt of the sword that Klaus decrypted in an ancient language. It revealed that there was only one dose of the cure. Knowing that with one dose, they wouldn't be using it on Klaus, Tyler decided to flee and go into hiding, knowing full well that Klaus would kill him the moment he was free. Caroline pleaded with Klaus to let Tyler go and after some persuasion, Klaus submitted but only that he'd give Tyler a headstart.

In Bring It On, Klaus saves Hayley from a vampire sent by Katherine to take her out for her part in the cure hunt. Klaus promises Hayley protection in exchange for her revealing to him all she knows about Katherine. Back in Mystic Falls, Klaus is visited by Damon who reveals that he knows about Hayley and wants to talk to her. Klaus refuses, although he does tell Damon about the vampire he attacked and that, due to the hybrid bite, does not have long to live. Klaus is later seen interrogating Hayley, after feeding her and she starts to reveal both her link to Katherine and her motivation: her desire to find her birth family led her to Katherine who promised that she could help if Hayley told her about the hunt for the cure. Klaus, enjoying the time spent with Hayley, then shows her his paintings and explains some of his motivations about art, namely his desire for control which he can channel through painting. Hayley then tries to convince Klaus to call off his hunt for Tyler, revealing that it wasn't resolve but the help of other people which would provide Tyler with his ability to escape him, just as Katherine had for five hundred years. Klaus later receives word from Rebekah that Hayley's attacker had been killed by Damon. He then tells Hayley that she can leave or stay. Hayley then reveals her liking for one of his paintings, saying that she liked it because it showed her how twisted Klaus really was, and that she could relate to it. The two then begin to make out before having sex. As Hayley is getting

dressed, Klaus notices a birth mark on her right shoulder and reveals that the mark was common to all the members of a werewolf clan in Louisiana. Hayley asks him to tell her about her birth family.

In Because the Night, Klaus arrives at the Salvatore House where Caroline is cleaning up after the previous night's party. She is still sore about the events of that night, namely Elena's attack on both her and her mother. She is also angry at Klaus for refusing to call off his quest to kill Tyler and refuses to forgive him. Stefan then arrives and reveals that he believes that Silas had followed them back to Mystic Falls. Klaus, although originally not interested, is alarmed when Stefan and Caroline reveal Silas's plans to bring down the Other Side, which would bring back every single one of Klaus' dead enemies. They raid Shane's office to find information about the Expression Triangle of massacres that he is trying to perform. During the search, Klaus and Caroline continue their bickering and Klaus states his belief that every person, no matter how pure their heart is, will be drawn to the dark. Caroline then finds out that the Triangle required three distinct massacres: a human one, a demon one (hence the massacre of the hybrids), and a witch massacre. Realizing Silas's plans, they deduce the location of the final massacre at two potential location and split up to find them. Caroline accompanies Klaus and they continuously bicker, leading Klaus to ask her why she went with him instead of Stefan. She says that she doesn't want him to kill Bonnie (who is working with Silas) when they find her. However, they are not at the right spot. When they join Stefan, they discover a coven of 12 witches led by Aja trying to purge Bonnie of the Expression magic by killing her. Stefan tries to save her but Klaus won't let him because this would call for the death of the linked witches, which would perform the final massacre. However, Caroline kills Aja, and the other witches to save her friend, despite Klaus' attempts to stop her.

Klaus later buries the witches and is shown to be angry at a distraught Caroline for performing the final massacre. Caroline tries to defend her actions by saying that she couldn't let Bonnie die but then realizes what she has done. Klaus then tells her that she needs comforting but he refuses to comfort her himself because of her words to him in the day and her actions that night. After Caroline leaves, Klaus is surprised to find Silas at the site, thanking him for performing the massacre. Silas then offers Klaus a deal: they can find the cure together and Silas will take it to accomplish his goals and therefore ensure that Klaus while not be at the receiving end of the cure. Klaus then boasts that he isn't scared of Silas, despite his age. However, Silas reveals that he stole the White Oak Stake from Rebekah and that he knows it is the only thing that can kill him. Klaus tries to attack Silas but the ancient immortal is much faster than him and stakes him from behind with the stake, breaking off the tip inside him, badly injuring Klaus before leaving him in severe pain.

In American Gothic, Klaus was trying to get the piece of the white oak stake was still inside his back in a spot he could not reach. Caroline arrived. She touched his face. Instead, she said, “As much as I’d love to watch you die, you still haven’t found me that cure.” It was Silas. He can take the shape of whomever he wants you to see.

Klaus was sweaty and cowering on th e floor when Caroline came in again. He started to think it was the real her when she quipped about how she should be running three prom committees at that moment. He told her about the white oak stake, and since he was hurt, she was the person to call. She found that hard to follow: He ran Tyler out-of-town and killed his mother. But, Klaus reminded her, if he dies, Caroline and everyone she knows dies. She had to help. He told her she’d need to cut the stake out of him. Caroline was having a difficult time getting the stake out of Klaus. Caroline finally smartened up: If Klaus wants her help, he’s gonna have to let Tyler come back and promise not to kill him. Klaus could feel the splinters moving toward his heart and begged Caroline to help him, but she wouldn’t until he promised not to hurt Tyler. He wouldn’t do that because Tyler tried to kill him, but yeah, Caroline’s right, Klaus has tried to kill most of them. This turned into a conversation about trust being the foundation of friendship, and Caroline angrily yelling that she should’ve turned her back on Klaus ages ago. That was a punch to the gut, but silver lining, Klaus’ pain was gone. Silas had gotten into his head and made him think he was dying. Caroline had taken Klaus’ mind off of it enough to break the spell, apparently. Seriously, if Silas can make Klaus think he’s croaking, then what can he do to the rest of them?

Caroline was ready to call it a night after using all of Klaus’ bleach to clean up. He thanked her for her help. She poked his chest when she told him if he needs anything else not to call her because she has a prom to plan. "Friends?" he asked. She asked if he was letting Tyler come back to town. He didn’t answer, at first. But he did then say she might have noticed that he’s not exactly scouring the earth for Tyler. She smiled a bit. So did he.

In Pictures of You, at Klaus' mansion, he and Rebekah tried to convince Elijah who should get the cure, and again, provide a little recap: Silas will torment Klaus until he gets it, but he'll also open the floodgates so every dead supernatural being returns to our side. Rebekah really wants to be human. Elijah, being sensible as always, told Klaus his personal discomfort wasn't enough of a reason to put the world in jeopardy. Klaus' smile turned to a frown when Elijah agreed to give Rebekah a shot at happiness, and he told Rebekah when she's dying and asking for his life-saving blood, he'll deny her and compel her to forget him.

When Caroline showed up, Klaus laughed at Caroline, obviously, but couldn't resist her when she smiled and begged him to go into his "creepy trophy chest of family collectibles" and find her a gown that would make her look "Princess Grace of Monaco" hot to which he did. Rebekah had given Elijah the white oak stake, and Elijah presented it to Klaus as a peace-offering. Now Klaus had nothing to fear -- except Silas' torment. Elijah said Klaus could outrun Silas if he had to, and that naturally made Klaus think of Katherine. Elijah asked Klaus to let him have this opportunity to feel and to love and Klaus refused. If he doesn't the get cure and ends up running, he's headed to kill her. He'll make sure Elijah is never happy.

Klaus had decided to go to the prom for some unknown reason and saw what had just happened. Rebekah argued that she'd acted with human decency and Klaus said no, the most human thing in that moment would have been if she could stomach standing by watching April die knowing she couldn't help her. Before this episode ended, he a letter from Katherine telling him about a witch in New Orleans plotting a move against him.

In The Originals, Klaus travels to New Orleans, concluding Katherine's letter about the witch planning a move against him. Once in New Orleans he finds a real witch amongst a group of fakes, he asks this witch where he can find Jane-Anne Deveraux, the witch tells Klaus she cannot tell Klaus where she is or it would be breaking one of Marcel's rules. Klaus then asks this witch were he can find Marcel. Klaus goes to a pub to find his progeny Marcel, who is singing on stage. When Marcel has finished he goes to cele

brate with his buddy's and spots Klaus in the corner of his eye. Klaus and Marcel start to argue before celebrating Klaus' return. Klaus is Marcel's sire, and Marcel has shared the secret of the daylight ring with his inner circle, who he considers family. How did he get witches to make them rings? Marcel said he has the witches wrapped around his finger. Klaus said he was looking for Jane-Anne. "Show time," Marcel said.

Marcel led Klaus and his inner circle on a walk through the city, where we saw vampires on balconies and rooftops. It was unnerving even before we realized there really was a mob mentality. They'd all gathered because Marcel was going to confront Jane-Anne about practicing witchcraft beyond the bounds of the rules set forth and enforced by him. She denied it, but he's aware of the witches' every move -- they can't do anything without getting caught. Marcel then killed her and before she died, Jane-Anne had exchanged looks with Klaus, who seemed disturbed by Marcel's display. Klaus was angry that Marcel had killed her before he could find out what she'd wanted with him. Marcel said he never wastes an opportunity for a show of force -- a lesson he'd learned from Klaus. He told Klaus he'd find out what Jane-Anne had wanted for him. Klaus asked if Jane-Anne had a sister.

He went to see Sophie, who was crying. She wouldn't talk to Klaus because two of Marcel's men had followed him. Klaus threatened to rip their spines out, then dropped a $100 bill so the blonde we'd later learn is bartending psychology student Cami could serve them. Klaus had gone to a wild party filled with vampires feeding on humans and dancing badly. He spotted a guy with a day ring, which means he's inner circle, and asked him where Marcel was. Klaus threatened him when he said he only answers to Marcel. Marcel broke it up and said nobody harms his guys. Klaus told him he doesn't need chaperones, and Marcel asked Klaus to just let the witch hunt go. They went out on a balcony, and Marcel explained that more hotels meant more tourists, which meant more fresh blood. He'd taught humans to look away. Klaus wanted to know how Marcel knows when the witches are using magic. Marcel wasn't telling. Marcel chose that moment to take vervain. He wants to limit the number of things he's vulnerable to. He's full of himself, which is why when they spotted clueless Cami walking alone at night below. If she was brave, he'd let her live, and if she was dumb, she was dessert but she proved to be brave. Elijah suddenly appeared on the balcony and told Klaus he'd found out who was conspiring against him. He took him to Lafayette Cemetery No. 1, where Sophie was waiting. "He's all yours. Proceed," Elijah said. She told Klaus that Marcel was out of control and she's going to stop him with his help. Hayley was brought out, and told Klaus he needed to listen to Sophie. Klaus laughed. How could they think this one night stand meant anything to him. That's when Sophie said she has a special gift, which is telling when women are pregnant. Hayley is carrying Klaus' child.

Klaus said vampires can't procreate, which is true. But Sophie said he was born a werewolf -- magic made him a vampire. So he's nature's loophole. Klaus blew up at Hayley telling her to admit she'd been with someone else. Hayley said she definitely would have confessed to sleeping around if she had, because it would have gotten her out of being captive. The baby is his. Sophie said Jane-Anne died performing the spell to confirm the pregnancy, and because of her sacrifice, the lives of Hayley and the baby are now controlled by them. If Klaus doesn't help them take out Marcel, Hayley dies. Elijah offered to kill Marcel, but Sophie said they have rules (and a timeline) that must be followed. Before Klaus could leave, Elijah told him to listen. Klaus could hear the baby's heartbeat. He finally said, "Kill her and the baby. What do I care?" Then, he stormed out. When Elijah caught up to him, Klaus insisted it was a trick. But Elijah saw it as a chance to take everything back. Here, now, is a chance for Klaus, Rebekah, and Elijah to have what they always wanted -- a family. "This is us. The Original family," Elijah said. "And we remain together, always and forever." Elijah said he was asking Klaus to stay there. He'd help him, stand by his side. He'd be his brother and they'd build a home together. "Save this girl, save your child," he said. His response: "No."

Klaus went back to see Marcel, again wanting to know how he controls the witches. They had a pissing match during which Marcel called New Orleans HIS TOWN. He's the one who got rid of the wolves, silenced the witches, and made people look the other way. "I'm not the prince of the Quarter, friend... I'm the king!" he yelled. "Show me some respect." To establish his dominance, Klaus bit one of the inner circle. He told Marcel he'd broken one of his rules and guess what, he cannot be killed because he's truly immortal. Klaus smiled and left.

Klaus walked to Jackson Square, where there was live music and painting. He spotted Cami, admiring the same artist. She doesn't paint, but she interprets art: Every artist has a story, she said. This one was angry, dark, doesn't feel safe, and doesn't know what to do about it. He wished he could control his demons instead of them controlling him. He was lost and alone. Klaus was emotionally fragile enough from a truly confusing evening that he nearly burst into tears.

He'd gone to sit on a bench alone and think. So naturally, Elijah joined him. They talked about how they'd both hated leaving New Orleans -- it was one of the few places they'd ever been happy. "What is on your mind, brother?" Elijah asked. The walls were coming down. It was a different kind of scene than we've ever seen between them. Klaus said for 1,000 years, he lived

in fear of settling in a town and having their father chase him out, which made him feel powerless. This town was his home, and in his absence, Marcel has gotten everything Klaus wanted -- power, loyalty, family. Klaus wants what he has. "I want to be king," he said. And what about Hayley and the baby? "Every king needs an heir," Klaus said. Later, Klaus gave his blood to cure the bitten vampire and said he'd like to stay in Marcel's city for a while if he's still welcome. He is.

In his last scene, he was on a street corner and left Caroline a message. He just said he was standing in his favorite place and hoped one day she'd let him show it to her.

Silas pretended to be Klaus in She's Come Undone, taunting Caroline in order to lure Bonnie out of hiding.

Klaus finally returns for Graduation. He saves Caroline and the oth

ers from the 12 witches that Caroline had killed. The night after graduation, Klaus and Caroline have a moment. He tells Caroline that Tyler is free to return to Mystic Falls. In the most charming moment of the night, Klaus points out that Tyler is Caroline's first love. Klaus intends to be her last however long it takes. Then he escorts her home. This will mark his final appearance in the show for now.