Rotor Walrus was a vital member of the Knothole Freedom Fighters. He used his skills and knowledge of technology and mechanics to provide the Mobians with an edge against the former despot Dr. Ivo Robotnik and, since his demise, the forces of Dr. Eggman. Following Sonic the Hedgehog's return from outer space, Rotor limited his involvement with field operations and stuck to providing data and technological assistance. In 3237, he was voted in as a new Council of Acorn member.