Naomi (AnnaLynne McCord) has to work with her arch-nemises Holly (guest star Megalyn Echikunwoke) to throw a campus costume party, leading to unfortunate consequences. Navid's (Michael Steger) plan to bring down his Uncle Amal (guest star Anthony Azizi) is threatened, while Silver (Jessica Stroup) discovers that political candidate Marissa Harris-Young (guest star Brandy Norwood) is not who she seems. Meanwhile, Adrianna (Jessica Lowndes) handcuffs herself to Dixon (Tristan Wilds) in an attempt to get him to stay sober and Annie (Shenae Grimes) must decide if she wants to give Patrick (guest star Chris L. McKenna) another chance.