As Caroline leaves, Carol shoots her with vervain.Elena and Alaric head to Tennessee and are followed by Damon. Klaus continues to try to create hybrids but fails when the hybrids end up bleeding to death or went crazy and Klaus had to kill them himself. Apparently so because Elena is still alive. Stefan meets up with Damon and tells him to protect Elena. Damon tells Elena that he is wrong about his brother and that Stefan can still be saved. Matt tries to connect with Vicki's ghost through Jeremy. Tyler realises his mother had captured Caroline, who is still being held captive. Tyler then shows his mother he is a werewolf as it was a full moon that night, showing that he was also a monster. Bill, Caroline's dad goes to see Caroline.Klaus and Stefan arrive in Chicago, where they knew each other during one of Stefan's previous periods as a Ripper in the 1920s. It is revealed that Klaus knew Stefan in the 1920s. Stefan met Klaus and Rebekah in a bar where Stefan fell in love with Rebekah and become like a brother to Klaus. Klaus and Rebekah had to leave and Klaus compelled Stefan to forget them. Klaus then daggers Rebekah when she chooses Stefan. In present day, he removes the dagger keeping her demobilized as she has what Gloria (a powerful witch) needs to help Klaus create hybrids. It is revealed that what Gloria needs is the necklace Stefan had given Elena. Damon gets a tip on Stefan and Klaus' whereabouts from Katherine so he and Elena follow the trail. They go to Stefan's old apartment, where Elena sees Stefan's list of victims. While there, Stefan and Klaus arrive. Stefan sees Elena hiding in his closet, but does not tell Klaus. Tyler tries to rescue Caroline, who is being tortured by her father, who believes he can change her urge to feed on blood by burning her in sunlight every time she feels the urge.In Chicago, Klaus uses Gloria the witch to find out why his hybrids are not turning out the way he planned and Gloria discovers that Stefan is hiding the fact that the doppelgänger is still alive. She tortures Stefan, but Katherine saves him. Back in Mystic Falls, Damon finds out Bill is impervious to compulsion and wants control of the Council. He temporarily kills Alaric but Alaric comes back to life. Damon then tries to kill Bill but Caroline saves her father by giving him her blood and has a fight with Damon. Meanwhile, Bonnie returns to Mystic Falls and Jeremy tells her about seeing his ex-girlfriends as ghosts. Stefan also tries to find out what Klaus and his sister Rebekah are running from. The answer turns out to be Mikael. Katherine steals Elena's necklace that can contact the Original Witch and teams up with Damon. Klaus brings Stefan back to Mystic Falls to find out what he is hiding.A senior prank night takes a deadly turn when Klaus finds out that Elena is still alive. Klaus threatens Elena by feeding Tyler his blood and kills him. He tells Bonnie that if she does not find a way to create hybrids, Tyler dies. He also tells Stefan to feed on Elena. Stefan tries to stop his urge, but Klaus makes him turn off his emotions and feed on her. Klaus finds out that Elena's blood is needed to create more hybrids. Meanwhile, Katherine and Damon go on a road trip to find a way to kill Klaus. Katherine remembers that Pearl told her about Mikael, the vampire hunter who was also a vampire. Matt, in an attempt to connect with Vicki, commits suicide. In a vision he sees her, and she tells him she can come back to life and has a message for Bonnie. Elena is in the hospital while a nurse, compelled by Klaus, takes her blood. Klaus is waiting to abduct Elena, but he flees when Damon tells him that Mikael is coming. Damon then saves Elena. Moments later, Stefan returns. Jeremy and Katherine find Mikael's tomb and watch as he opens his eyes.506"Elena and her friends begin their senior year of high school and she remembers that it has been one year since she met Stefan. Elena is frustrated by her helplessness, so she convinces Alaric to teach her about protecting herself from vampires. Mikael wakes up and bites Katherine. Bonnie and Jeremy are having issues since Jeremy keeps seeing Anna. Klaus' sister, Rebekah, moves in with the Salvatores and attends school. Matt continues to see the ghost of Vicki, and she convinces him to perform a ritual that allows her to come and go from his world as she pleases. She says a witch from the other side promised her that if she killed Elena she can come back forever. The gang attends a bonfire, where Elena, Damon, and Alaric try to capture Stefan. They learn Tyler is sired to Klaus since Klaus essentially made him who he is. Rebekah sets her sights on Tyler. Elena saves Stefan from a fire after Vicki tries to kill Elena in Alaric's van. Jeremy and Anna realize he can feel her. Vicki is eventually restored back to the other side by Bonnie and Matt while Damon goes home, where Mason Lockwood appears in front of him.Mason, in ghost form, chains Damon up and tortures him. Damon tells Bonnie about Mason torturing him. Elena realizes she needs Lexi to help bring Stefan back and asks Jeremy to contact her. As Bonnie tries to send the ghosts away but instead gives them physical form, Jeremy kisses Anna and Elena sees them. Bonnie is reunited with Grams who tells her that she needs to restore balance of nature. Damon and Alaric see Mason at the Grill who says he wants an apology and to help Tyler. Stefan sees Lexi who tries to help him find his humanity by working with Elena. Mason tells Damon that he knows where to find a weapon that can kill Klaus, so they search for it buried underneath the Lockwood estate. The tomb vampires return and attack the founding families. Anna took the necklace that sends the vampires back but gives it back to Jeremy. Bonnie sends all the ghosts away. Just before that, Mason shows Damon a secret cave containing the story of the Originals but disappears before he can tell Damon what was inside. Lexi disappeared before Stefan turns back on his humanity and Elena decides to live her life while she waits for Stefan to decide he wants to hope for the future again. Bonnie realizes the necklace was not and Alaric finds mysterious cave drawings.
With help from Elena and Bonnie, Alaric tries to decipher the meaning behind his recent discovery. From the writings on the cave wall, he deciphers that Mikael is 'Papa Original', as Damon puts it, the father of Elijah, Rebekah and their other siblings. Elena and Rebekah engage in a mean-girl power struggle, until Rebekah reveals some of her family's ancient secrets and the violent past she shares with Klaus and Elijah. She reveals how the family became vampires. They were once neighbors to a village of werewolves and one night, Klaus and their brother, Henrik, snuck out to see the men change into wolves when it went wrong, and Henrik was killed. The family was distraught and the loss made Mikael obsessed with making the family invulnerable. His wife, a witch, the Original witch, aided them in becoming vampires but nature found ways of ensuring that they had weaknesses. Rebekah also tells Elena that it was Mikael who killed their mother when he found out about her infidelity to him but it is later on deciphered from the writings on the cave wall that it was actually the hybrid, Klaus, who killed his mother, in a fit of temper and rage. This new revelation causes Rebekah to lose faith in her brother. Damon tries a reckless new approach to make a breakthrough with Stefan by releasing him from his imprisonment and they're both surprised by an unlikely ally, Mikael, who has been freed by Katherine.On the night of the Homecoming dance, Rebekah opens up to Elena about why the evening is so important to her, leaving Elena with conflicting emotions, Elena then stakes Rebekah leaving her unable to attend the Homecoming dance, Meanwhile, Damon and Elena team up with Mikael to come up with a plan to kill Klaus. They leave Stefan behind, afraid of him betraying them. Tyler warns Caroline that Klaus is prepared for whatever they plan to do, but vervains her to keep her out of it. Damon and Tyler fight, but Bonnie keeps them from killing each other. Mikael tries to lure Klaus out of the house by threatening and then killing Elena, revealed in the end to be Katherine. Damon reveals he has the White Oak stake and tries to stake Klaus. However Klaus is saved by Stefan as he pushes Damon out of the way. Klaus then stakes Mikeal leaving him to burn to death, revealing Stefan has now earned his freedom from compulsion. Tyler tells Caroline it is better being sired to Klaus because he does not have to turn any more. Stefan is revealed to be working with Katherine. Katherine had woken Stefan in order to save Damon from Klaus' hybrids, who were ordered to kill him in case of his death. Stefan managed to care enough to save him, thanks to Katherine convincing him. Stefan is finally able to trap Klaus in a conflicting position by taking his daggered family from.Bonnie has a dream about the witches' massacre house, where she finds the coffins of the Originals. One coffin opens and she sees the body of Klaus with the Original Witch's necklace. Back in reality, Stefan asks Bonnie for help in hiding the coffins from Klaus. Bonnie, with help from the dead witches, can make the coffins invisible. She informs Stefan that the coffin she saw opening in her dream is the key to tormenting Klaus but it is sealed with a spell. Klaus wants Elena and Damon to find Stefan in order to get his coffins back but when they refuse, he gets a hybrid to run over Jeremy who has been off vervain due to Tyler's influence and has been compelled by Klaus. Alaric pushes Jeremy out of the way and gets run over. His ring brings him back to life but does not heal him; he needs vampire blood to heal him. Alaric meets Dr. Meredith Fell (Torrey DeVitto), who is intrigued with his amazing ability to heal. Stefan reveals to Damon that he stopped the plan to kill Klaus to save Damon's life. Stefan then reveals his plan to torment Klaus in revenge for what Klaus turned him into and refuses to return the coffins, despite Klaus' attempts to kill Jeremy. Elena makes a deal with Klaus to spare Jeremy's life in return for Rebekah's daggered body. When Elena reveals to Klaus that Rebekah wants him dead because he killed their mother, Klaus keeps the dagger in her. Elena asks Damon to compel Jeremy to leave Mystic Falls and move away with family friends so he can have a normal life away from the supernatural. Elena thanks Damon for everything and Damon admits that because Stefan saved him, he cannot feel guilty for wanting what he wants (Elena, his brother's girl). He then says "if I'm going to feel guilty, I'll feel guilty about this and kiss Elena.
Although Caroline is in no mood to celebrate her eighteenth birthday, Elena, Bonnie and Matt surprise her with a funeral to celebrate the old Caroline Forbes. Bonnie disagrees with Elena making Jeremy leave town by compelling him to. Damon and Stefan disagree on the best way to handle Klaus, and a reckless Stefan decides to test his theory by taking things to dangerous extremes and beheading one of Klaus' hybrids. Bonnie is concerned when Elena tells her about Jeremy's new plans. At a Founder's meeting, Alaric once again runs into Dr. Fell, who is in the middle of an argument with her ex-boyfriend, the medical examiner. Klaus asked Tyler to bite Caroline to punish Stefan. Tyler refuses to go along with Klaus' latest demand, and is surprised when Klaus seems to accept his decision. Stefan tries to behead another hybrid but is stopped by Damon. Tyler went to meet Caroline where she was having her birthday party and told her that he loves her and kisses her but accidentally bites her. Stefan kidnaps Elena and threatens to drive off Wickery Bridge and make her a vampire so Klaus cannot make any hybrids. Klaus gives in and Stefan stops the car. Stefan and Elena fight about his methods and he reveals he does not care about what she thinks of him any more. Klaus goes to save Caroline after Tyler tells him what he did. Klaus tells Caroline of the joys of being a vampire and lets her decide if she wants to be saved. She tells him she does not want to die, so he feeds her his blood to save her. Jeremy left Mystic Falls as he was compelled by Damon and Caroline wakes to find a bracelet left by Klaus. Elena goes back to Wickery Bridge and says good-bye to the Elena that was supposed to die with her parents. Dr. Fell's ex-boyfriend is found dead in the woods with a stake in his heart although he is not a vampire.Bonnie realizes she needs to find her mother, Abby, to get the sealed coffin open. Tyler gets Bill to come and help him resist the sire bond. Klaus negotiates with Stefan to control the coffins of his family members. Elena and Bonnie go to see Abby and meet Jamie, a surrogate son of Abby's. Abby returns and tells them she is the one that desiccated Mikael. Damon investigates Dr. Meredith Fell and the death of her boyfriend. She then vervains him and drains some of his blood. Tyler learns to break the sire bond, he must turn and own the pain of being a werewolf. Abby tells Bonnie she did not come back because she had a chance at a new, normal life. Abby offers to help Bonnie but drugs her as Jamie shoots Stefan, revealing that he has been compelled. They kidnap Bonnie and Jamie is compelled to shoot himself if she does not give up the location. Elena tricks Jamie into freeing her and she knocks him out as she saves Stefan. Elena tells Stefan about her kiss with Damon. Klaus gets to the coffins, but Damon hides the big, sealed coffin. Alaric discovers a secret about Meredith: she uses vampire blood to treat her patients. Bill is transported to the hospital with animal bites by Tyler and she uses Damon's blood to save him. Abby tells Bonnie she will help her if she can get her magic back. Bill tells Tyler he must turn until there's no more pain to break the sire bond. Alaric kisses Meredith. Stefan punches Damon and Damon reveals he pulled the dagger out of Elijah, as Elijah kills one of the hybrids.
Klaus and Elijah fight, but stop as Klaus reveals Mikael is dead. Elena and Alaric are shocked when they learn of Elena's fingerprints on the wooden stake that killed medical examiner Brian Walters. Elena suspects Stefan, but he denies it. Stefan and Bonnie take Abby to the sealed coffin for her to figure out to open it. Caroline discovered someone stabbed Bill, killing him and turning him into a vampire. Along with the lively company of Elijah; Damon, Stefan and Klaus agree to consult a truce over dinner, with Damon trying to keep Stefan on good behavior. Bill decides not to complete the transition leaving Caroline distraught. Elena and Alaric suspect Meredith of finding and using their weapons to murder the coroner and Bill. Elena goes to comfort Caroline, and Matt shows up as well. Elijah and Klaus tell Damon and Stefan of Tatia, the original Doppelgänger. It was Tatia's blood used to turn them into vampires. Abby and Bonnie manage to break the seal. Klaus negotiates to bring Elena with him if they would leave. Elena and Matt arrive back home to find Alaric wounded, and to save him Elena, being a supernatural doppelgänger, had to kill him, so that he could come back to life. Klaus threatens to burn Stefan but everything takes a turn when the daggers are pulled out of Kol (Nathaniel Buzolic), Finn (Casper Zafer), and Rebekah (Claire Holt), who are Klaus's siblings. Caroline says good-bye to her father and Matt stays with Elena while they wait for Alaric to wake up. Stefan tells Damon that he loves Elena and Damon replies "so do I". Sheriff Forbes reveals the attacker is not Meredith as Alaric wakes back up. Bonnie and Abby are out cold as the sealed coffin is revealed to be open. Esther, the supposedly deceased mother of the original family, is revealed to have been in the coffin and wants to have her family back.Matt and Elena leave the hospital, where Rebekah tries to attack her before Elijah saves her. Elena is surprised to receive an invitation to a formal ball and a meeting with Esther. When Damon and Stefan hear the party is being hosted at Klaus's newly renovated mansion, they both insist on attending the event with her. Tyler calls Caroline and apologizes, saying he is still working on fixing himself. Caroline and Matt also receive invitations to the ball from Klaus and Rebekah, respectively. Despite telling Damon and Stefan she would not go to the ball, Elena shows up anyway. The ball commences with a dance, Elena with Damon, Caroline with Klaus, Matt with Rebekah. Elena then dances with Stefan and then convinces him to help her get to Esther. Elena learns that Esther intents to kill the originals by linking their lives together and then sacrificing Finn by his own will. Then she must decide who she can trust with her new information. Caroline discovers a more sensitive and romantic side of Klaus no one would have suspected. Elena gets all the Originals to drink and link themselves. Elena reaches out to Stefan but he says that if he feels again all he feels is pain. Finally, after an evening of violence and dashed hopes, Damon finds a new way to cope by sleeping with Rebecca After Elena finds out about Damon's latest indiscretion, she second guesses helping to kill the Originals and is frustrated with her friends for not agreeing with her. Elijah confronts her and reveals he knows she lied. He then leaves Elena in a cave. Meanwhile, Bonnie and her mother, Abby, find themselves playing a part in a ritual to appease the spirits of nature (by killing all the Original vampires with a spell requiring 2 generations of Bennett witches). Rebekah keeps Elena in the cave as Elijah goes to Stefan and Damon. Elijah tells them they can either stop Esther from completing the ritual by killing either Bonnie or Abby or Rebekah kills Elena. This they turn to Meredith and Alaric for help in killing Kol which ends up dagger the others linked to him. Elena escapes from Rebekah's watch and hides in the cave where no vampires can enter. Klaus finds out about the ritual as well. Rebekah tries to set Elena on fire but Elena reasons with her before she can. Klaus, Elijah, and Kol find Esther and Finn about to complete the ritual. Damon and Stefan find Bonnie and Abby and decide the only solution is for Damon to turn Abby, thus preventing her to be a witch anymore. Stefan reveals he has not had human blood since he almost drove Elena off the bridge. Elijah writes Elena a letter of apology and realizes they are not as good as they think they are. Kol flees, Elijah says he is leaving, and Esther and Finn have fled their family. Rebekah realizes the White Oak tree is still out there. Alaric wakes to find his weapon and case files so Meridith shoots him.In 1912, Zachariah Salvatore, a council member is murdered in the same way they have been in present day. Flash forward, Alaric has been put into jail by the Sheriff after Meredith said he came at her with a knife and she had to shoot him. The present-day murders in Mystic Falls remind Damon of a similar crime spree a century earlier. In flashbacks to 1912, Stefan and Damon attend Zachariah's funeral and learn he was not the first council member murdered. Rebekah searches for the White Oak tree in town and she needs the Salvatores to find it. Damon recalls a beautiful vampire, named Sage (Cassidy Freeman). Elena questions Meredith, who reveals she knows more about Alaric's past than Elena does. Elena and Matt break into Meredith's apartment and find a secret box of files on the Council members. Sage shows Damon a whole new way to exist: a woman is not only a prey, but also a pleasure. Matt and Elena find a Gilbert journal that belonged to the original Jonathan Gilbert's granddaughter, but Meredith came home before they could search more and she catches them. Rebekah and Damon follow Stefan as Damon feeds on a girl, trying to force him into feeding on a woman in order to learn how to fight his urges. Elena and Matt find Stefan feeding on the woman but Matt pulls her away. Elena and Matt go back to her house, where Matt gives her back the Gilbert journal. Alaric is released from jail after the coroner's office sends an error about time of death. In 1912, Damon convinces Stefan to drink human blood, but Stefan kills the woman and turns into a Ripper. In present time, Damon pledges to help Stefan in a way he did not in the past. Stefan reveals Samantha Gilbert confessed to the murders in 1922, but Damon says he already had killed her. Meredith comes to explain herself to Alaric, saying that it was him that committed the murders all because of the Gilbert ring.Meredith cannot find anything wrong with Alaric and he believes he is going crazy because of the ring so he gives it back to Elena. Elena and Damon fight about how to teach Stefan to feed on human blood. Caroline brings Abby some blood, but Abby is not handling being a vampire well after losing her connection to the earth. Sage returns to Mystic Falls to find Finn, the love of her life. Stefan tells her that Samantha Gilbert went crazy and killed herself. Damon seduces Rebekah with Sage's help. Bonnie says she can reverse the damage done to Alaric with a spell. Damon and Sage find the way to kill the originals: the old Wickery Bridge was made of white oak tree. Alaric attacks Meredith, but luckily Stefan and Elena arrive in time to save Meredith and Stefan manages to control his blood lust. Sage finds out that the Originals are linked and that Finn will be killed as well, so she betrays Damon and Rebekah burns the wood. Bonnie heals Alaric and forgives Elena for her part in her mother's death. Bonnie's mother leaves after losing control and attacking her surrogate son, Jamie. Damon finds another way to kill the Originals.Damon and Stefan make plans to destroy Klaus with their new weapon. Klaus and Rebekah convince Finn to cooperate with their plans to break the link when they reunite him with Sage. Rebekah gets carried away with her own plans out of revenge against Damon for using her to steal her memories of the remaining white oak wood. She stakes Damon with a dagger, then takes him to Klaus' mansion, chains him to the ceiling and cuts him to bleed out his protective vervain. Klaus coerces Bonnie into breaking Esther's linking spell. Bonnie is unsure if she can perform the unlinking spell, but Klaus threatens her mother and shows her that he has Kol watching Jeremy. Stefan lures Finn out of the bar where he was having tequila with Sage, and fails to stake him, but Elena and Matt manage to use Matt's stake to kill Finn. As Finn expires, Bonnie successfully breaks the linking spell making Finn the only Original to die. At the mansion, Rebekah manipulates Damon's hallucinations so he believes he and Elena are about to kiss after she saves Damon and urges him to drink her blood to recover. But then Damon realizes how desperate Rebekah is for attention and love, and that she is actually torturing him for violating these feelings rather than for tricking her to access her memories. Stefan is attacked by Sage, who is upset over Finn's demise. Sage is about to end Stefan when she coughs up blood and dies.
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