I.Q. / J.D. Bennett (voice)
Mother-1 / Helen Bennett (voice)
Madame-O / Augusta Wembly (voice)
Dr. Scarab (voice)
Prof. Amadeus Sharp (voice) (as Allen Oppenheimer)
Rock-1 / Meg Bennett (voice) (as Bobbi Block)
Sport-1 / Eric Bennett (voice)
Mycroft Hughes (voice)
Karate-1 / Bunjiro 'Bunji' Bennett (voice)
Glove / Filthy Larry Forward / Dog / Bat / Snake / Rats (voice)
Bionic-1 / Jack Bennett (voice) (uncredited)