Guest Stars Bumper Robinson voices Falcon Jim Meskimen voices Ultron Fred Tatasciore voices Black Bolt Catherine Taber voices Medusa Antony Del Rio voices Inferno Fred Tatasciore voices Volstagg Nolan North voices Gorgon Mark Hanson voices Seeker Travis Willingham voices Inhuman Guard Nolan North voices Guard Antony Del Rio voices Boy Oliver Vaquer voices Karnak