Psych: Season 6, Episode 13

6 - 13: Let's Doo-Wop It Again

Shawn and Gus team up once again with Gus's a cappella group (Jaleel White and Mekhi Phifer) to solve the attempted murder of the founder (Cheech Marin) of an at-risk youth program. Meanwhile, Marlowe (Kristy Swanson) returns