Katherine (Nina Dobrev) finds out Nadia (Olga Fonda) is her daughter while Caroline (Candice Accola) and Tyler (Michael Trevino) call it quits in the Vampire Diaries episode "Monster's Ball."

"Monster's Ball" opens up on Dr. Maxfield (Rick Cosnett) analyzing new vampire Jesse (Kendrick Sampson). Confused about what's going on Jesse lashes out at Maxfield, who deems him an "excellent candidate."

Back at school, Elena (Dobrev) struggles to move on after finding out about Bonnie's (Kat Graham) death and notes that Caroline and Tyler have each other as distractions. Elena's distraction is Maxfield, who suspiciously covered up her roomate Megan's (Hayley Kiyoko) vampire-related death. Elena ignores Damon's (Ian Somerhalder) phone call but is busted when he turns the corner and accepts her invitation to the Whitmore Historical Ball. At the Ball, the college puts out its entire collection and students dress up as historical figures.

On her way to class Elena passes by the memorial for Megan and meets Aaron (Shaun Sipos), who tells her that Megan was a friend of his growing up. Aaron doesn't tell her his name, but does tell her that he doesn't believe Megan committed suicide.

Elena Meets Aaron

Meanwhile, Nadia and Silas (Paul Wesley) continue fighting over possession of Katherine, who Nadia has locked with her in a motel room. Katherine tells her not to mess with him and suggest Nadia just give her up so he can drink some of her blood and be done with it. Nadia informs her that in order to cure himself, Silas needs to drain every drop of blood from her. Katherine pieces together that because she's human now, she would die if he got a hold of her.

Damon tells Jeremy (Steven R. McQueen) that he wants to work with Silas. Since Silas wants to die so that he can reunite with his true love, Damon figures that he can use Silas to bring Bonnie back to Elena. When Silas takes the cure to become a witch, he can possibly swap his life for Bonnie's. Bonnie, knowing Silas can't be trusted, says that he shouldn't do this. Jeremy, however, tells Damon that she's in.

Nadia finally feeds a starving Katherine and promises that she'll let her go if she tells her if she'd sold out Pearl (Kelly Hu) and her daughter by naming them as vampires in 1864. Katherine tells her that it's true and that she did it to escape Klaus (Joseph Morgan). Nadia, who had turned herself into a vampire to track Katherine for over 500 years, tells Katherine that she also killed her mother in Paris in 1645. When Klaus had caught up with Katherine, she identified Nadia's mother as Katerina Petrova the one he and his minions were after. Katherine realizes Nadia was never going to let her go and stakes her with a cane as the leave the restaurant, purposely missing her heart and running off.

It's the night of the Whitmore Historical Ball. Stefan (Wesley), dressed as James Dean, pulls Caroline, dressed as Bonnie of Bonnie and Clyde, onto the dance floor. Damon, as Henry VIII, asks Elena, as Anne Boleyn, to dance, but she's not in the mood. She's too focused on figuring out what happened to Megan. She spots Aaron and compells him to tell her if he killed Megan. He tells her he didn't, and that the reason he's avoiding her is that everyone around him tends to die. She compells him to forget their conversation and he introduces himself plainly to her.

Qetsiyah (Janina Gavankar) approaches Stefan at the bar and offers to buy him an "I'm sorry" drink, but Damon pulls him away. Caroline and Tyler are having a bad time at the dance and Caroline suggests they slip away, but Tyler tells her he didn't just come to the dance to get her forgiveness and get her into bed. There's something more, but the scene cuts to Qetsiyah and Silas dancing together. He wants her to tell him she still loves him, but she refuses. Using his powers, he compells her to admit that she created the anchor, but that the Travelers hid it after they killed her and move it around frequently. She's just at the dance to find a pendant that belongs to her on display. Once she finds it, it will increase her powers, allowing her to use the locator spell and find the anchor. He makes her forget the conversation and she leaves as Stefan comes to.

Katherine finds Nadia in an alley with the cane still stuck in her chest. She tells her that she knows the story about Katherine killing her mom in 1645 was fake, because she'd been running from Klaus and his minions for 150 years and there was no way they'd mistake anyone else for her. Twisting the cane, she tells Nadia she'd never believed her story. Nadia tells her the truth — she did kill her mother, but it was in England in 1492. She'd put Nadia's mother's head in a noose and knocked her off the chair, snapping her neck. Then she tells Katherine the kicker. "My name is Nadia Petrova. And you are my mother."

Katherine Finds Out That Nadia Is Her Daughter

Back at the dance Maxfield, dressed as Dr. Jekyll, and Elena dance, and he tells her his theory about Megan. He believes that a vampire ripped out her throat and threw her off that building. She wants to know more, but he tells her that he'll never see her again because people are asking questions she doesn't want asked. He suggests she pack up and move back to Mystic Falls. Could he be trying to protect her?

Tyler finally tells Caroline the truth — they're only back together because Klaus gave him permission, and he can't live with that given what he's done to Tyler's family. He tells her that he came to the dance to say goodbye before he leaves to find a way to destroy Klaus' life. She begs him to stay, but he can't.

Qetsiyah, meanwhile, has found the pendent. Stefan tricks Damon by pretending to still be out and snaps his neck before finding Silas and Qetsiyah. Stefan tells her that Silas has been working with Damon and lying to her. She tells Silas that while she had loved him once, he had broken her heart and that it's time to break his. She reaches into his chest and stops his heart, revealing his true form – a grey, hideous monster.

We then find out that Maxfield is Aaron's legal guardian, in charge of his trust fund. He tells Aaron to stay away form Elena and stay safe.

Damon and Elena come across Silas. Elena thinks it's good news that Silas is gone, but Damon knows it isn't. Now he may not be able to get Bonnie back, and Stefan's memory has returned.

Nadia wakes up in a hotel room with the cane out of her chest and is surprised to find Katherine still with her. Katherine explains that she stayed because Nadia knows how to avoid "the diabolical ones" pretty well. Katherine also tells Nadia that she'd returned to Bulgaria to look for her, but never found her.

Back at Salvatore Mansion, Damon figures out that SIlas can trade his life for Bonnie's if he becomes a witch. The only way to do that is to drink the cure, Katherine's blood. He tricks Katherine into coming over and bites her neck before handing her over to Silas to drink. She falls to the floor, seemingly dead. Suddenly, her eyes open and her heartbeat comes back.

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