Rotor Walrus

Rotor Walrus (Mark Ballou (Season 1)/Cam Brainard (Season 2)) - A walrus who is the mechanic of Freedom Fighters. He invents reliable gadgets for the Freedom Fighters in Knothole and on their missions. He fears Robotropolis and, unlike his best friend Sonic, usually stays behind to work. In the second season, he was completely redesigned and had a replacement voice actor.