After making a decision that infuriates Klaus (Joseph Morgan), Elijah (Daniel Gillies) proposes a life-changing challenge for Rebekah (Claire Holt). Caroline (Caroline Accola) finds that her carefully laid plans for the perfect Senior Prom night are disrupted by Elena (Nina Dobrev), so she turns to an amused Klaus for a solution. Determined to get through to Elena, Damon (Ian Somerhalder) and Stefan (Paul Wesley) both attend the prom, but the evening begins to spiral out of control despite their efforts. When Elena suddenly lashes out in a way no one could have predicted, Matt (Zach Roerig) turns to Rebekah for help. Finally, Bonnie (Kat Graham) makes a terrifying discovery, and Klaus receives a message that could change everything.