On the first day of their senior year, Elena, Caroline, Bonnie and Matt are still reeling from recent events, while Tyler seems to be enjoying everything a little too much. Damon is annoyed by a new houseguest, and everyone is surprised by the arrival of a new student in Alaric’s history class. Matt asks Bonnie for help when he realizes he made a serious mistake. Meanwhile, Stefan continues to carry out his latest assignment from Klaus.
Despite all that has happened, Caroline is determined to see that Elena, Bonnie, Matt and Tyler all enjoy a traditional Senior Prank Night before the school year begins at Mystic Falls High School. However, when uninvited guests shows up, it doesn’t take long for the evening to take a deadly turn. Damon convinces Jeremy that he can use his new connection to the other side to help find a way to defeat Klaus. Klaus deepens his hold on Stefan and uses him for increasingly violent and dangerous purposes involving Elena too. And finally, Tyler and Caroline's relationship will suddenly be in danger.
Still in Chicago, Klaus (Joseph Morgan) uses Gloria (guest star Charmin Lee), a witch he knew long ago, to help him track down missing information that will explain why his plan isn’t working. Gloria’s spells reveal intriguing glimpses of the truth, but she soon realizes she needs Stefan’s (Paul Wesley) knowledge to complete the puzzle. When Stefan suddenly finds himself in danger, help comes from a surprising ally. Back in Mystic Falls, a frustrating new enemy pushes Damon (Ian Somerhalder) over the brink and he lashes out in a way that will have lasting consequences. Caroline (Candice Accola) struggles with her own emotional issues, even as she tries to help Elena (Nina Dobrev) face her feelings. Jeremy (Steven R. McQueen) makes a brief but disturbing breakthrough with one of his ghostly visitors, leaving him more confused than ever. Finally, Bonnie (Kat Graham) has a strange encounter that will affect everyone. Matt Davis also stars. Wendey Stanzler directed the episode written by Brian Young
Klaus and Stefan arrive in Chicago, where Stefan is reunited with a vampire who hasn’t really moved on from her interest in him decades earlier. In a flashback to Chicago in the 1920s, Stefan comes face-to-face with a shocking chapter from his wild past. After Damon gets a tip on Stefan and Klaus’ whereabouts from an unexpected source (Katherine), he and Elena follow their trail. Back in Mystic Falls, Tyler is concerned about Caroline and turns to Sheriff Forbes for help. Stefan also learns that Klaus might be running from someone who may be hunting him.
Elena and Alaric secretly head to Tennessee to find a pack of werewolves, who they believe might lead them to Stefan. Matt and Jeremy team up to summon Vicki's spirit. Alaric tips Damon off to where he and Elena are. Klaus attempts to turn all the werewolves of Ray's pack in to hybrids. But the hybrids not only turn out rebellious but defective, with the newly turned Ray escaping Klaus and Stefan's guard and nearly killing Damon. Upon Carol Lockwood discovering that Caroline is a vampire, Caroline's father Bill is summoned to Mystic Falls.
Klaus and Stefan begin hunting for one of the oldest werewolf clans so that Klaus can turn them into vampires in order to continue the breed of hybrids. Stefan and Klaus find out that Damon has been tracking them down through the reported killings and animals attacks mentioned in newspapers and other sources. Stefan goes back and gives Damon a 'warning' to back off by killing Andie, Damon's semi-compelled girlfriend, after compelling her to fall off a high platform. Meanwhile, Elena's 18th birthday arrives and Caroline holds a party for her. During the party, Jeremy continues to see the ghosts of Anna and Vicki, but keeps it to himself. He eventually admits the hauntings to Matt, though Matt jokes and brushes the matter off. Alaric, who has settled as Elena and Jeremy's guardian after Jenna's death, decides to move out of their house, as he considers himself a bad role model for them. Elena finds out about Damon's plans to find Stefan, without notifying her and confronts him, though he is already upset by Andie's death and Stefan's change of attitude. Caroline becomes jealous of Tyler's date Sophie at Elena's birthday party and compells her to leave. Tyler then confronts her about their issues, they end up kissing eachother and leaving the party for Tyler's house. In the morning, Caroline attempts to leave the Lockwood household quietly but is caught by Mrs. Lockwood. As Caroline grabs her purse to leave, her skin suddenly burns as it turns out the purse had been spiked with vervain. This confirms Mrs. Lockwood's suspicions that Caroline is a vampire. Mrs. Lockwood then shoots Caroline several times with vervain darts, leaving her unconscious.
Elena and Jeremy try to return to normal activities by attending Mystic Falls' screening of "Gone with the Wind". Damon attempts to win Elena's forgiveness even though he admits that he doesn't deserve it. Elena refuses him. Damon then attempts to commit suicide as he knows what will happen due to the werewolf bite but he is stopped and locked up by Stefan. Stefan seeks Bonnie's help to find a cure for a werewolf bite. He asks Bonnie to help him contact Emily so they can find a cure for Damon. Emily refuses to cooperate, but Bonnie hears the witches say a name: Klaus. During this time, Klaus has completed the transformation into a wolf and awakens to find Elijah waiting for him. He makes Klaus remember his deal: he must reunite Elijah with their family which Klaus says he will. Stefan goes to see Klaus and asks him for the cure. Klaus says he must first keep his promise to Elijah, that he would reunite him with the family he killed. He then betrays Elijah, stabbing and killing him with the dagger for the second time. Klaus reveals that his blood is the cure for a werewolf bite by biting Katerina and then giving her his blood. In exchange for a vial, Klaus wants Stefan to become a ripper again and leave Mystic Falls with him, claiming that he has big plans for him. Stefan agrees and drinks human blood to prove himself. Sheriff Forbes attempts to ambush Damon at the Salvatore house, but Damon escapes. Jeremy is the next to intercept Damon and brings him to the Grill. Sheriff Forbes finds them and shoots at Damon, but hits Jeremy instead. Bonnie takes him and begs the witches to bring him back to life, which they do, meanwhile warning Bonnie of "consequences". The news of Jeremy's revival reaches Caroline and her mother, who make amends. Elena finds a delirious Damon and brings him back home, where Elena kisses him after Damon confesses his love for her. Katherine interrupts with Klaus' cure. Later, Klaus tests Stefan once more, asking him to chase and kill a human girl. Once Stefan does this, Klaus says they can now leave Mystic Falls. At the Gilbert house, Jeremy is awakened by noises. He goes downstairs, where he finds his deceased vampire ex-girlfriends Anna and Vicki.
Matt and Caroline are in the Lockwood cellar while Tyler - in wolf form - attacks them. Matt panics and shoots Tyler. Meanwhile, Greta feeds Jenna her blood, completing her transformation into a vampire. It is revealed that Elijah is seeking revenge on Klaus for killing all of his family and burying their bodies at sea. Stefan receives a call from Damon revealing that Klaus plans to use Jenna as the vampire sacrifice; Stefan however wants to offer himself as the sacrifice in place of Jenna. Meanwhile, Klaus has begun the ritual and has already killed Jules. Stefan arrives and asks Klaus to switch places with Jenna; however, Klaus does not accept his offer and kills Jenna. Back at the boarding house Jeremy, John, Bonnie, Damon, and Alaric find a spell that can bring someone back to life after they have died by connecting the life of the parent and the child. John has Bonnie complete the spell on him, connecting him and Elena together. At the ritual grounds, Stefan watches in horror as Klaus drains Elena's blood. Back at the old mansion, Bonnie leaves with Damon and Elijah, she casts a spell on the house trapping the humans inside, unwilling to let anyone else get hurt. With the doppelganger dead, Klaus has completed the ritual and begins to transform. However, Bonnie arrives and uses her powers to weaken him, while Damon kills Greta. With Klaus on the brink of death, Elijah steps in. Before Elijah can rip out his heart, Klaus says he didn't bury the bodies at sea and if he is killed, Elijah will never find them. He promises to take Elijah to them, and gives him his word. Elijah rethinks the situation, but Stefan and Bonnie urge him to not trust Klaus. However, he changes his mind and leaves with Klaus. Damon takes Elena's body to the old mansion on the site of the witch massacre, and waits for her to come back to life, hoping she won't come back as a vampire as he doesn't want her to hate him forever. Back in the basement, Jeremy reads the whole spell and realizes that once the child is revived the parent will die. He asks John if he read the whole passage and John replies that he did. John gives Jeremy a letter and his ring to give to Elena. While Damon, Jeremy, and Alaric watch as Elena comes back to life, John silently walks away. Elena comes back to life and John looks at her one last time and falls to the ground dead. Jeremy and Elena are devastated at losing both their parents. Before the funeral, Elena apologizes to Jeremy saying that because of her he has lost everyone. Jeremy replies that at least he has her. At the funeral, Damon reveals to Stefan that he was bitten by Tyler and asks him to do Elena a favor and not tell her as the last thing she needs is another grave to mourn. Stefan promises to find a cure, but Damon says there is no cure and walks away.
As Elijah, Stefan, and Elena discover a way to save Elena, Damon does not trust Elijah. Elijah tells Elena that the way to break the curse is by channeling the power of the full moon into the moonstone, sacrificing a vampire, a werewolf and by drinking the blood of the doppelganger. He can save Elena by giving her an Elixir. Maddox uses a mind-control spell and makes Carol Lockwood call Tyler and tell him that she had an accident and is in the hospital. Maddox injures Carol by pushing her down the stairs in her home, which forces Tyler and Jules to return to town, after which Maddox and Greta kidnap Caroline and Tyler. Damon tells Elena that he cannot lose her, to which Elena responds he won't, that she trusts Elijah, and the Elixir will work. Damon tells her there is another way and feeds her his blood. Stefan attacks Damon and Damon puts a wooden stake in him. Alaric returns as himself, gives everyone the message from Klaus that the ritual will happen tonight and Jenna forgives him. Damon realizes that if Klaus doesn't have a werewolf he cannot complete the ritual, buying Elena another month. He uses Katherine's help and rescues Caroline and Tyler from the tomb and kills Maddox. Tyler starts transforming and attacks Damon. Damon saves himself, but tells Caroline and Matt to go to the Old Lockwood estate. Stefan and Elena spend a romantic day together and Elena tells Stefan that she doesn't want to become a vampire. Klaus comes and takes Elena. Damon visits Klaus and tells him that he has to postpone the ritual because his werewolf and vampire are gone. Klaus laughs and tells Damon that after trying to break the curse for a 1000 years he has learned to have a backup werewolf (Jules), a backup witch (Greta) and backup vampire. He then attacks Damon. Elena is being led through the woods by Greta and tells her that Dr. Martin and Luka said that she was being held captive by Klaus and they died trying to rescue her. Greta informs Elena that they were mistaken, in an unapologetic tone. Greta takes Elena to the site of the ritual. There Elena sees Jenna dead on the ground. She asks Greta why Klaus killed her. Greta replies that Jenna isn't dead, she is in transition, and she wakes up as a vampire. Back at Alaric's house, Katherine say that she is sorry for doing Klaus' bidding (turning Jenna into a vampire) and Damon asks Katherine why Klaus didn't use him and Katherine replies that Klaus said that he was as good as dead. She asks him about his arm, Damon checks his arm and recognizes a werewolf bite from Tyler's premature transformation into a werewolf.
After Elena removes the dagger, Elijah wakes and must immediately leave the house as he has not been invited in. Elena asks him to trust her and gives him the dagger to prove she's being honest. In a flashback to 1492 England, Katherine meets Elijah and Klaus for the first time. Stefan and Damon argue over Elena's disappearance and whether or not they should go after her and Elijah. Elena tells Elijah everything that has happened since his death. In return, Elijah tells Elena about Klaus. Elijah and Klaus were raised as brothers, but Klaus was in fact the result of their mother being unfaithful with another man, who was from a werewolf bloodline. Elijah's father hunted down the man and had him and his family killed, beginning the schism between werewolves and vampires. Klaus is a vampire/werewolf hybrid and can only be killed by a witch. The sun and the moon curse was a fake created by Elijah and Klaus -- the real curse is that Klaus' werewolf side had been forced into dormancy by witches. He wants to bring it to the surface and eventually create his own race. Jenna finally finds out about the vampires from Stefan and Klaus/Alaric. Elsewhere, Katherine is being held captive by Klaus. Damon finds her and gives her a vial of vervain to protect her from further compulsion. At the end of the episode, Maddox and Greta (Luka's sister) perform a ritual releasing Klaus' spirit from Alaric's body, and putting it back into his own.
Klaus (in Alaric's body) compels Katherine to tell him everything she knows, about how the others plan to kill Klaus. He meets Bonnie, Elena, Stefan and Damon in the Salvatore house, that is now officially Elena's. Elena tells them about a girl who was compelled at school to tell her, that "some hot guy, wanted to have her last dance at the 1960´s dance that evening." Because the others don't recognize Klaus he finds out that Bonnie gained power, that could threaten his life, and that this was their plan to kill him. Matt talks to the sheriff and tells her that he is going to have a hard time making Caroline believe he really forgot everything. The sheriff asks him to try anyway since she needs some time to work things out. At the school dance Jeremy confronts Bonnie again on why she wants to kill herself for Elena and they are overheard by Damon. Jeremy goes to Stefan for help and Stefan tells Elena. After his conversation with Stefan, Jeremy is attacked by people Klaus compelled. Elena and Bonnie follow who they think is Alaric to help him. When Klaus leads them to an empty hallway Elena finally guesses who Alaric really is. When Bonnie notices that Klaus's plan is to kill her, by provoking her into using too much energy she and Elena flee and bump into Damon. Damon tells Elena to find Stefan and then asks Bonnie if she is willing to do what has to be done to kill Klaus. When Stefan and Elena return they find Damon alone and Bonnie fighting with Klaus. After a few striking blows at Klaus Bonnie sinks to the ground and Stefen and Elena can't find a pulse. Damon cuts in and tells them to leave and that he would take care of the body, since the sheriff shouldn't find out about it. He takes Bonnie to the house, where she had received her power and she wakes up there and Jeremy promises to stay there with her. At the Salvatore house Elena grieves the loss of Bonnie, when Damon tells her, that if they want a chance to win Klaus must believe Bonnie is dead. So he had planned everything with Bonnie. That evening Elena shows up at Damon's bedroom and she tells him she understands why he didn't tell her the plan. Damon states that he will always choose Elena, if it should ever come down to Bonnie and Elena again. After this conversation Elena goes down in the basement and pulls the dagger out of Elijah's heart.
Elena and Alaric become angry with John when Isobel's unexpected arrival devastates Jenna; Alaric punches John as a result. Alaric meets up with Isobel. She tells him she just wants to apologize and that she did love him. After saying this, Alaric is overpowered and abducted by a warlock from Klaus' inner circle named Maddox. Meanwhile, Bonnie works with Jeremy and Damon in order to find the spell they will need to gather the power of the witches killed in the massacre. Damon takes them to the site where the witches were burned. Damon knew where it was because he had tried to save Emily. Inside the house Damon finds that he cannot move. His ring then stops working and he begins to burn. He tells Bonnie to help and she closes her eyes and starts muttering a spell. Bonnie tells him that she doesn't think that the witches like him being there. Elsewhere, Caroline is heartbroken and doesn't know what to do about Matt. Matt is waiting at Caroline's house when she arrives back home. He demands that she tell him what happened to Vicki. After Caroline has told him, he tells her that he doesn't want to remember any of it. Caroline compels him to forget, but it is later revealed that it was a setup by Sheriff Forbes to find out everything about the vampires. Matt had already drank some vervain before he went to Caroline's house, so her compulsion didn't work. Isobel kidnaps Elena and takes her to a cemetery where they stand at her grave. Isobel receives a phone call from Maddox who tells her that she has finished what Klaus compelled her to do and is free to let Elena go. Isobel then tells Elena she is sorry that she was a disappointment to her, then removes her necklace and burns to death in the sun. That night, Elena is wondering why she feels bad about Isobel's death. Stefan says it is because she was her mother. John then wakes up after he was killed by Isobel as a distraction for her to kidnap Elena. He and Elena have a talk and he tells her that if his not being there makes her feel safe then he'll leave, but Elena tells him that she wants him to stay because he is the only parent she has left. Stefan and Damon realize that Bonnie is their new secret weapon because neither Isobel nor Katherine knew that Bonnie had her powers back and the power of the massacred witches. Bonnie and Jeremy are at Elena's house when Jeremy reads the warning the witches gave to Bonnie and is upset because if Bonnie uses too much power she will die. He asks her how much power she will need to kill an Original and Bonnie tells him that she needs all of it. She tells him that if she dies it was to save Elena, him, and everybody else. Katherine, who had been taken by Maddox, wakes up in an apartment to see Alaric in a chair and Maddox chanting a spell. Alaric then walks up to Katherine, takes her face in his hands, and says that he has missed her. Katherine realizes that it is Klaus who has taken control of Alaric's body.
Elena finds out that Katherine is free from the tomb and is upset. Damon asks Katherine if she knew that killing Elijah with the dagger would also kill him; Katherine says she knew, but wanted her freedom more. Stefan and Bonnie try to persuade Jonas and Luka to work with them; however Jonas wants Elijah alive again. He performs a ritual with Luka, which puts Luka in the boardinghouse in invisible form (his true body remains with his father). Jonas asks him to remove the dagger from Elijah's body. When Luka tries to do that, Katherine shows up and stops him. Jonas then orders Luka to kill her; a confused Katherine then gets staked and she screams for Damon. Damon runs to Katherine to pull out the stake, and not knowing about the presence of Luka, uses a flamethrower to prevent the removal of the dagger. This results in Luka's body getting fatally burned back in Jonas' house and he dies. Stefan realizes it was an act of Jonas and goes to his house to make peace, but an angry Jonas blames Stefan and Damon for his dead son and wants revenge. He disables Stefan and leaves the house to kill Elena. Katherine tells Damon how she made a deal with John Gilbert so that Damon would die instead of Stefan. In the grill, Caroline sings a song for Matt to get his attention; he is flattered by her act and kisses her. Bonnie tells Elena about her relationship with Jeremy and is surprised by her positive response. Jonas shows up at the grill and brings on a massacre by exploding all the lights and setting a fire. Bonnie tries to stop him, but he disables her; Matt tries to help Bonnie and then Caroline, but Jonas stabs him in the neck with a broken bottle. Caroline sees Matt dying and forces him to drink her blood to save his life. Elena goes upstairs in her house to the bathroom where Jonas attacks her, but it is actually Katherine and she bites him; it was part of a plan to save Elena. Bonnie tells the others that it wasn't necessary to kill him. She then reaches out to close his eyes, but Jonas seemingly attacks her, which results in Stefan breaking his neck. Alaric tells Jenna that he loves her, and that there are things about the death of Isobel that aren't his to tell. Jeremy tries to comfort Bonnie for losing her powers, but Bonnie tells him that Jonas didn't attack her; he returned her powers and told her how to kill Klaus. Katherine asks Damon where the site of the "witch massacre" is, but he refuses to tell her anything since he still doesn't believe that she wants to help them. Matt awakes and remembers what happened, and Caroline tells him that she's a vampire. Matt panics and accuses her for the death of Vicki and runs away from Caroline. In the end, Isobel shows up at Elena's house and tells Jenna that she is Elena's mother, but Jenna only realizes who she is when Elena says her name.
The episode begins with Elena reading one of Jonathan Gilbert's journals. Jonathan recounts a night Stefan attacked him (Jonathan wore a ring to protect himself) and killed two of the Fells. After that Stefan tells her the whole story himself. When he first turned, he was brutal and inhuman until Lexi showed him the path of love and humanity after which he fought for his life. Stefan asks Elena the same, to fight for her life and not to give up. Damon invites Elijah over to the boardinghouse for a dinner party with the intent of killing him. Elijah warns Damon that if he has any "dishonarable intentions", he will kill him and everyone in the house. Jonathan Gilbert's journal reveals that if a vampire uses the dagger to kill an Original, both will die; it becomes clear that John helped Damon with the dagger so that he could also die with Elijah. Stefan calls to warn Damon and Alaric answers the phone. Alaric then writes on paper to Damon that the dagger will kill him if he uses it. While Elijah is seated at the dinner table, Alaric sneaks up behind him and stabs him with the dagger, killing him. They then drag his body to the basement, but later find that he is gone; Elena had read in the journal that the dagger must not be removed or the Original will come back to life. Elijah goes to Jonas and asks him to find Elena at the moment. Jonas seems to realize the witchcraft of Bonnie on his son, he goes to Elena's house where Jeremy was helping Bonnie to enhance her channeling ability. In anger, he takes away her powers and threatens her that "she'll answer to him if any harm comes to his son". John blackmails Alaric into giving him his ring back once Jenna starts asking Alaric questions about Isobel. Elijah shows up at the lake house telling Elena that the deal is off, and even though he has not been invited in, he's very patient and will wait them out. Elena tells Elijah that if they don't renegotiate, she'll stab herself with a knife, have Stefan give her his blood, and then kill herself like Katherine did, becoming a vampire and of no use to him. Elijah calls her out on a bluff, but Elena stabs herself, meaning she wasn't. Elijah gives his word to Elena and begs her to let him heal her. She staggers into Elijah's arms and stabs him with the dagger, killing him again. Damon moves from behind the wall and Stefan quickly rushes to Elena's aid. Elijah's body is dragged down to the basement like before. Elena tells both Damon and Stefan that she'll fight, but they need to start doing things her way to which they agree. Damon comes back to find Katherine in his shower. Elijah's compulsion on her has worn off with his death, and she says she's going to stay to help them.
Stefan and Elena decide to spend a weekend at the old Gilbert family lakehouse, unaware that they've been followed by Tyler and Brady. Jenna starts to worry that Alaric isn't being honest about his past with her. Jules and Brady explain the significance of the sun and moon curse to Tyler but fail to tell him about the sacrificial role of Elena in it and lure him into helping them if he wants to stop transforming. Damon meets Elijah at the Historical Society Tea Party in order to resolve some questions about the original vampires and a sacrifice of the doppelgänger, but Elijah stabs him in the neck with a wooden pencil and tells him once he is of no use to him, he will kill him. Bonnie seeks the help of Caroline and Jeremy to perform a hypnosis spell on Luka in order to get information about the Originals and him and his father's relationship with Elijah. Luka reveals Elijah plans to kill Klaus by making him vulnerable after sacrificing Elena. He also reveals that Klaus has his sister and they want him dead, which is why they are working for Elijah. Jules with the help of her other werewolf friends torture Damon at his house for information about the moonstone, but Elijah intervenes, killing all the werewolves while Jules escapes in the confrontation. Brady, with the help of Tyler, finds Stefan and shoots him with a wooden bullet. Brady leaves Stefan with Tyler as he goes to find Elena. Stefan then tells Tyler he doesn't want to break the curse because Elena would have to die. Tyler has a change of heart and frees Stefan, who kills Brady in order to save Elena. Meanwhile, Jeremy and Bonnie confess their feelings for the other, and share a kiss. Stefan figures out that Elena knew about Elijah's real plan for her, telling her she's being a martyr and not heroic. Tyler, before leaving town with Jules, meets Matt and tells him that he has feelings for Caroline but he knows that Caroline loves him. He tells Matt to take care of her. The episode ends with Jules and Tyler leaving town.
Tyler questions Caroline about Mason's death and is infuriated that she kept Mason's death a secret from him. Jenna becomes upset over the revelation that John is Elena's biological father. Jules meets her wolf-lover Brady in the woods and tells him she wants to take Tyler with them and leave town. Caroline asks Stefan to try and reason with Tyler, while Jules takes Caroline hostage. Jules calls Stefan and tells him to bring Tyler to her in exchange for Caroline. Stefan calls Elena to inform Damon of the situation and tells John to make sure Elena doesn't get involved. Damon and Stefan both approach Jules with Tyler. Stefan tries to make peace, but when that fails Damon offers his "bloodier" method. Jules then calls on her wolf friends and although Damon and Stefan are outnumbered, they still manage to kill most of the wolves. Tyler hesitantly releases Caroline from the cage, but watches as Jules has Caroline at gunpoint. As Stefan and Damon are about to get staked, Jonas, on Elijah's behalf, shows up and incapacitates Jules and Brady and gives Tyler a message: "Tell your friends to get the hell out of this town." Tyler tries to apologize to Caroline, but she furiously declines and tells him they are no longer friends. Tyler goes back to Jules and Brady and informs them that Mason was probably killed because he found the moonstone. Brady asks Tyler the location of the moonstone, and tells him he has no idea. Damon tries to see why John Gilbert has returned and John tells him he is here to protect Elena. John reveals to Damon that the only way to kill an Original is with a dagger dipped in white ash wood that dates back to the beginning of the Originals. It is shown at the end that John is still working with Katherine and trying to get her out of the tomb.
Stefan has his own ideas about Elena’s new plan for the future. He tries to contact Isobel and gets in touch with John Gilbert who comes home in the end. While Damon tries to get the truth of how to cure a wolf bite out of Jules, he asks Elena to keep an eye on Rose, a situation that turns unexpectedly dangerous, almost fatal to Elena when Rose mistakes her for Katherine. Although Rose struggles to cope, she wishes she were back home with her friends and family, "being" human again. Caroline and Matt try to be honest about their feelings for one another. They both confess their love for the other. Tyler’s reaction to Caroline's generosity comes as a surprise to her. Meanwhile, Rose escapes from the Salvatore house and kills three people before Damon and Elena are able to find her. Damon carries Rose back to his room where she gets worse and is in more pain. Rose tells Elena that Damon wants to care, but when he does he runs away from it. Damon intervenes in Rose's dream placing her back in her homeland as a human. In Rose's dream, she reminds Damon that he built a life for himself while she spent the last 500 years just existing. Rose asks Damon if she'll see her family again and he says he thinks she'll see whoever she wants to see. Rose says that would be nice and maybe she'll see Trevor, too. She tells Damon she's not afraid anymore. Hearing that she is not afraid anymore, Damon prepares to stake her. As Rose counts down to a race, Damon, while crying, stakes her, giving her a peaceful death. Damon admits to Elena that he knows she is his friend and that he does feel because he was supposed to have died. Elena realizes he feels guilty, but Damon says that would be human of him, and he's not. He tells her to go home, but before she does she hugs him as he struggles not to cry. He confesses to a stranger on the road named Jessica, who is compelled "not to move", that his big secret is that he misses being human. He struggles with the dilemma of whether to bite her or not. He lets her go, but bites her soon after. Tyler meets Jules at the Grill, where she informs him that she knows he and Mason are werewolves; Mason is dead and that Caroline and her vampire friends were behind it. Tyler disagrees and she tells him there are more werewolves out there and they're on their way.
As the full moon approaches, Caroline helps Tyler prepare for his painful transformation; she stays with him until forced to leave when he tries to attack her. In the tomb, Katherine taunts Stefan over his insecurities about Elena. In response to Katherine's insistence of her love for him, Stefan asks her to prove that there is some good in her, and she grudgingly advises him to ask Isobel, Elena's mother, for help in finding Klaus. Bonnie later seeks Luca's help to destroy the moonstone; they cast a spell that appears to work, but it is revealed that Luca tricked Bonnie when he hands the moonstone, still intact, over to his father on Elijah's orders. Jules, a friend of Mason's, arrives in Mystic Falls looking for him after Tyler leaves a message on Mason's voicemail. A suspicious Damon and Alaric try to trick her into having a drink mixed with wolfsbane; she is provoked into revealing she is a werewolf, and threateningly tells Damon he has been marked. Elijah, who reveals that he no longer works for Klaus, arrives at the house and makes a deal with Elena: she has to keep herself safe from Klaus (so that Elijah can eventually use her as bait to kill Klaus) and in return, Elijah will protect her friends and family and free Stefan from the tomb. As Stefan exits the tomb with Elijah, Katherine begs him not to leave her there, but he walks away and is happily reunited with Elena. Caroline reunites with Tyler, holding him as he cries about the trauma of the night before. He never got out of the enclosure. Damon and Rose talk at the Salvatore mansion; Jules, in wolf form, attacks them and bites Rose's shoulder. Though the wound appears to heal at first, Rose's shoulder becomes infected - a werewolf bite is fatal to a vampire.
Stefan and Damon plot to get the moonstone from Katherine so they can lift the curse. Elena asks Rose to take her to Slater so they can learn more about Klaus and where to find him. Instead, they find Slater's staked corpse in his house. Elena uses information from his computer to get Klaus's attention, saying that she, the doppelganger, is willing to surrender. Rose protests, but Elena insists that surrendering is the only way to protect the people she loves from Klaus. Meanwhile, Caroline and Tyler discuss the approaching full moon and explore the underground tomb on the old Lockwood family property. They discover Mason's journal and the video diary that he had used to document his extremely painful transformations. Bonnie forms a plan to lift the spell from the tomb and temporarily incapacitate Katherine so that Stefan can quickly grab the moonstone, but Jeremy goes ahead with the plan by himself and is captured and fed on by Katherine. He manages to toss the moonstone out of the tomb. Stefan arrives and pushes Jeremy out safely, but is trapped in it himself. Later, Jeremy and Bonnie almost kiss. Damon arrives at Slater's house and tells Elena that he will not let her surrender to Klaus or put herself in danger. Three unnamed vampires confront Damon, Rose, and Elena. Elijah shows up killing one and Rose flees. The remaining two vampires want to take Elena to Klaus, but Elijah kills them too and leaves Damon and Elena unharmed. They return to Mystic Falls; Elena tries to run to Stefan in the tomb, but Damon restrains her. Stefan makes Damon promise to protect Elena, and he agrees. Elijah and Luca's father discuss what had happened at Slater's house. Elijah states that he spared Damon because he could see that both Damon and Stefan would protect Elena, which is what Elijah has been trying to do.
The episode begins in Bulgaria in 1490 and shows Katherine, surrounded by her family, giving birth to a baby girl. She asks to hold the baby but her father says that Katherine has shamed their family enough and takes the baby away, leaving Katherine sobbing. Present day, Elena goes to the tomb, where she offers Katherine a bottle of blood in exchange for the truth - a dopplegänger from the Petrova line can be used to break the curse. Elena, as Katherine's descendant, is the current Petrova dopplegänger. Katherine reveals that she was kicked out of Bulgaria and fled to England; she assimilated into English society, where Elijah and Trevor found her. They recognized her as a Petrova dopplegänger and Elijah tried to kill her, but Trevor - who had fallen in love with her - helped her escape. She became a vampire so that she couldn't be used to break the curse. Katherine came back to Mystic Falls to offer Klaus what he needed to break the curse: the current dopplegänger (Elena), a witch (Bonnie), a werewolf (first Mason, then Tyler), a vampire (Caroline), and the moonstone. She hoped that in exchange, Klaus would spare her life. Then Katherine reveals that Klaus killed her father, mother, and sister to get back at her for running away. Meanwhile Bonnie meets a warlock named Luca and his father, and Jeremy is jealous of Bonnie's attraction to Luca. Damon and Rose go to get more information about Klaus from Rose's vampire friend, Slater, but they are overheard by a fully healed Elijah. Damon and Rose sleep together, and at the end of the episode Elijah compels Slater to stake himself. It is revealed that Luca and his father are working for Elijah.
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