'Psych': Jaleel White, Mekhi Phifer are Gus' Blackapella teammates

Zap2it's got an exclusive sneak peek of Wednesday night's (March 21) "Psych" episode, "Let's Do-Wop It Again," where Jaleel White returns as Gus' former Blackapella teammate Tony.

Joining him this time is Mekhi Phifer as Drake - June (Kenan Thompson) is a no-show and the guys are irked. Meanwhile, Cheech Marin also guest stars as the creator of a youth program who gets shot.

And Lassie makes a trip to the big house to check in with his lady love, Marlowe Viccellio. She has an interesting way of ingratiating herself with the prison cliques - watch that sneak peek clip here.

"Psych" airs Wednesday nights at 10 p.m. ET/PT on USA. Also, be sure to tune for Character Chatter with Kirsten Nelson, who plays Chief Karen Vick on the show, during tonight's episode.