Vincent Price as Dr. Goldfoot / General Willis

Fabian as Bill Dexter

Franco Franchi as Franco

Ciccio Ingrassia as Ciccio

Francesco Mulè as Colonel Doug Benson

Laura Antonelli as Rosanna

Frankie Avalon as Craig Gamble (uncredited) (archive footage)

Susan Hart as Diane (uncredited) (archive footage)

Dwayne Hickman as Todd Armstrong (uncredited) (archive footage)

Aron Kincaid as Motorist Who Hits Diane (uncredited) (archive footage)

Moa Tahi as Hardjob - Dr. Goldfoot's Assistant (uncredited)

George Wang as Fong (uncredited)

Ennio Antonelli as Goldfoot Henchman (uncredited)

Amerigo Santarelli as Goldfoot Henchman (uncredited)

Veriano Ginesi as Bald Goldfoot Henchman (uncredited)

Silvana Bacci as Robot (uncredited)

Antonietta Fiorito as Robot (uncredited)

Gianfranco Funari as US Army Official (uncredited)

Louis M. Heyward as American General (uncredited)

Mario Bava as Angel with Harp (uncredited)