Carol’s overbearing parents visit for Christmas. To avoid her mom’s wrath, Carol gets Nate and Tom to cover-up their failed relationships and pretend to be happy. But Nate starts to believe the lie and considers getting back together with his ex-wife.
Damon is forced to deal with a part of his past he thought was gone forever when Dr. Wes unleashes a secret weapon to stop him from rescuing Elena. Meanwhile, Elena learns about the dark history of Whitmore College; and Katherine turns to Matt for help.
Oliver is drugged after a fight with Cyrus Gold and left for dead. Felicity tries to cure him but the cure causes Oliver to hallucinate and he is visited by ghosts from his past. Meanwhile, Barry and Felicity grow closer; and Roy is captured and tortured by Brother Blood.
Sue develops an allergy to the Christmas tree. Meanwhile, Axl returns home from college and chooses to spend time with his pals instead of his family, which displeases Frankie; and Brick devises a scheme to cover his lie about his wrapping-paper sales.