Guest Stars Zeno Robinson voices Additional Voices Erika Harlacher voices Additional Voices John DeMita voices Additional Voices Bill Rogers voices Additional Voices Tony Oliver voices Additional Voices Imari Williams voices Additional Voices Kellen Goff voices Additional Voices Doug Stone voices Wilson Billy Kametz voices Patrick David Vincent voices Mad Dog Brad Venable voices Ryan Joe J. Thomas voices Graham Kaiji Tang voices Spacer Xander Mobus voices Mad Dog Bill Butts voices Mad Dog Chris Tergliafera voices Mad Dog Armen Taylor voices Mad Dog Anthony Tai voices Yu En