Psych

The impressive list of Psych guest stars just grew by two names.

Mekhi Phifer and Cheech Marin will stop by for an episode of the USA series later this year, TV Guide reports, as the former portrays Drake, a member the a cappella group to which Gus belonged to in college. Why does he show up?

To honor his lifelong mentor, Marin's character of Deacon Jones.

Jaleel White and Kristy Swanson will also reprise their roles as Tony and Marlowe, respectively, on the upcoming installment.

Psych, meanwhile, returns on October 12 and we've posted photos from the season six premiere HERE.