Michael McKean

as Mr. Bream (voice)

Courtland Mead

as Gustav Patten 'Gus' Griswald (voice)

Ashley Johnson

as Gretchen Grundler (voice)

Jason Davis

as Mikey Blumberg (voice)

James Earl Jones

as Mister (voice)

Rickey D'Shon Collins

as Vincent Pierre 'Vince' LaSalle (voice)

Andrew Lawrence

as Theodore J. 'T.J.' Detweiler (voice)

Bobbi Page

as Chorus (singing voice) (uncredited)