After a high school lab experiment goes horribly wrong, Mordecai and Rigby must go back in time to battle an evil volleyball coach in order to save the universe — and their friendship.
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)
