Stefan & Caroline Take Mary Louise & Nora To the Heaven & Hell Ball on 'Vampire Diaries'

Mary Louise (Teressa Liane) and Nora (Scarlett Byrne) dress up as an angel and devil for a Halloween party in this still from The Vampire Diaries.

In “I Carry Your Heart With Me”, just as Damon (Ian Somerhalder) thinks he’s gained the upper hand in his fight against Lily (Annie Wersching), an unexpected turn of events leaves him scrambling for a plan B.

Elsewhere, when the fallout of Damon’s actions gains the unwanted attention of Mary Louise and Nora, Stefan (Paul Wesley) and Caroline (Candice King) are forced to spend the night distracting the girls at Whitmore College’s Heaven & Hell ball.

Finally, after suspecting that she’s up to something, Enzo (Michael Malarkey) sets off on a mission to find out what Valerie (Elizabeth Blackmore) is hiding, while a plan set by Alaric (Matt Davis) and Bonnie (Kat Graham) leaves their worlds turned upside down.