J.G. Quintel as Mordecai / Hi-Five Ghost (voice)

William Salyers as Rigby (voice)

Sam Marin as Benson / Pops / Muscle Man (voice)

Mark Hamill as Skips (voice)

Minty Lewis as Eileen (voice)

Jason Mantzoukas as Mr. Ross (voice)

David Koechner as Principal Dean (voice)

Roger Craig Smith as Jablonski / Frank Smith / Fast Food Guy (voice)

Ali Hillis as Ship Computer / Rigby's Mom (voice)

Kurtwood Smith as Gene (voice)

Eddie Pepitone as Sherm (voice)

Paul F. Tompkins as Gino (voice)

Fred Tatasciore as Father Time / Security Guard / Additional Voices (voice)

Steve Blum as Techmo / Brit / Commander / TV Game (voice)

Janie Haddad Tompkins as Margaret (voice)