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. Klaus coerces Bonnie into breaking Esther's linking spell. Rebekah is more interested in her own plans to torture Damon for revenge. 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 and Matt stakes him. Bonnie successfully breaks the linking spell. Stefan is attacked by Sage, who is upset over Finn's demise. Sage is about to end Stefan, but dies suddenly. Stefan, Elena, and Caroline realize that if an Original is killed, their entire vampire bloodline dies. Stefan negotiates with Klaus, bringing eight of the stakes with him in exchange for his brother. Damon has been bled out of vervain and is compelled by Klaus into admitting there are eleven stakes in total. Stefan hands over one, and after Rebekah releases Damon, promises to bring the other two. Caroline and Elena puzzle over the vampire bloodlines and realize that Tyler is a part of Klaus', and he would die if Klaus were killed. Stefan and Elena share a conversation about their feelings and Elena admits she doesn't know how to feel about her love for both Stefan and Damon. Damon goes to retrieve the last white oak stake but finds that Alaric's vampire hating alter ego has hidden it.
Damon finds the way to kill the originals with the help of Sage. However, Sage finds out that the Originals are linked and that Finn will be killed as well, so she betrays Damon. Alaric attacks Meredith, but luckily Stefan and Elena arrive in time. Bonnie's mother leaves after losing control and attacking her "son". Bonnie heals Alaric and Stefan and Damon find another way to kill the Originals at the end of the episode.
The present-day murders in Mystic Falls remind Damon of a similar crime spree a century earlier. In flashbacks to 1912, Damon recalls a beautiful vampire, named Sage (Cassidy Freeman), who showed him a whole new way to exist. Sheriff Forbes warns Damon not to get involved in her investigation of the murders, but Damon is convinced she's going after the wrong suspect Alaric. Meanwhile, Elena and Matt resort to breaking and entering in their search for evidence to prove Meredith is the killer they find a hidden door in her closet with a Gilbert journal that belonged to the original Jonathan Gilbert's granddaughter. For reasons known only to her, Rebekah becomes interested in locating one of the town's oldest landmarks that involve information Stefan and Damon might have on what happened to it or where it is. Finally, Elena comes to a new understanding of the path her life has taken, and Damon makes an emotional confession to Stefan after forcing him to drink fresh human blood and Elena seeing him with blood all over his mouth and Damon feeding a pretty girl his blood. The episode ends with Meredith at Elena's house explaining to Alaric that he is the killer because of his Gilbert ring that lets him cheat at death as the same thing happened to the granddaughter of Jonathan Gilbert in 1912.
After Elena finds out about Damon's latest indiscretion, she is frustrated with her friends for not agreeing with her on how they should react about the Original family's internal power struggle. Meanwhile, Bonnie and her mother, Abby, find themselves playing a part in a ritual to appease the spirits of nature. Stefan and Damon are given an ultimatum from Elijah that puts Elena in danger so they turn to Meredith and Alaric for help which ends up being a terrible choice.
Elena is surprised to receive an invitation to a formal ball, and 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. Caroline and Matt also receive invitations to the ball from unexpected admirers. At the elegant party, Elena learns of a horrifying plan that could lead to the original families death and she must decide who she can trust with her new information. Caroline discovers a side of Klaus no one would have suspected. 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 Rebekah.
Elena and Alaric are shocked when they learn of Elena's fingerprints on the wooden stake that killed medical examiner Brian Walters. After being accidentally attacked by Tyler, Bill suffers the consequences of having vampire blood in his system which was given by Dr. Meredith Fell; when someone stabs him, 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, except everything takes a turn when the daggers are pulled out of Kol (Nathaniel Buzolic), Finn (Caspar Zafer), and Rebekah (Claire Holt), who are Klaus's siblings. Bill decides not to complete the transition leaving Caroline distraught, and Elena and Matt arrive back home to find Alaric wounded, and to save him Elena being a supernatural doppleganger had to kill him, so that he could come back to life. Bonnie and her mother Abby manage to open up the locked coffin, which contains the supposedly deceased mother of the original family. Stefan told Damon that he loved Elena and Damon said "so do I".
Bonnie is reunited with her estranged mother Abby, Klaus negotiates with Stefan to control the coffins of his family members, Tyler tries to regain his free will with the help of Caroline's father Bill, and Damon becomes intrigued by Alaric's new friend Dr. Meredith Fell which leads Alaric to discover a new secret about her: she uses vampire blood to treat her patients. Elena tells Stefan about her kiss with Damon. At the end of episode Klaus gets his family back by compelling Abby to get the location of the coffins out of Bonnie, but Damon hides the big, sealed coffin. Also, Damon resurrects Elijah.
Although Caroline is in no mood to celebrate her 18th birthday, Elena , Bonnie and Matt surprise her with a small party in an unusual location. 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. 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. Tyler refuses to go along with Klaus' latest demand, and is surprised when Klaus seems to accept his decision. 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. Klaus give Caroline his blood and saved her. Jeremy left Mystic Falls as he was compelled by Damon. Dr. Fell's ex-boyfriend is found dead in the woods with a stake in his heart although he is not a vampire.
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 doesn't 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 can't not 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 he kisses Elena.
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. Meanwhile, Damon and Elena team up with Mikael to come up with a plan to kill Klaus. Caroline and Matt are shocked at Tyler`s behavior throughout the evening. The night takes a surreal turn when Klaus puts his latest plan in action. Determined to outsmart Klaus, Damon enters in a dangerous partnership leading to a terrifying turn of events. Stefan is finally able to trap Klaus in a conflicting position.
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, sneaked 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.
Bonnie learns about the ghosts and tries to send them away but instead gives them physical form. Elena catches Jeremy kissing Anna, Bonnie is reunited with Grams, Damon can see Mason, Stefan sees Lexi, and the tomb vampires come back. Mason tells Damon that he knows where to find a weapon that can kill Klaus, so they search for it. Lexi attempts to help Stefan find his humanity, and the tomb vampires attack the founding families. At the end, Bonnie sends all the ghosts away. But before that, Mason shows Damon a secret cave containing the story of the Originals.
Elena is frustrated by her helplessness, so she convinces Alaric to teach her about protecting herself from vampires. Mikael wakes up and bites Katherine. On the first day of school, 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 and Alaric try to capture Stefan. Tyler feels beholden to Klaus since Klaus essentially made him who he is. Elena saves Stefan from a fire after Vicki tries to kill Elena in Alaric's van. Vicki is eventually restored back to the other side by Bonnie while Damon goes home, where Mason Lockwood appears in front of him.
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 doesn't 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.
In Chicago, Klaus uses Gloria the witch to find out why his hybrids aren't 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 changes his attitude and kills Alaric but Alaric comes back to life. Damon then tries to kill Bill. Caroline saves her father by giving him her blood and has a confrontation 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.
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