Robert Davidson Director Mario Bava Director, Cinematographer John Merivale Dr. John Fielding Actor Didi Sullivan Ellen Fielding Actor Gerard Herter Max Gunther Actor Daniela Rocca Linda Actor Vittorio Andre Prof. Rodriguez Actor Daniele Vargas Bob Actor Arturo Dominici Nieto Actor Rex Wood Actor Filippo Sanjust Screenwriter Sam Schneider Producer Bruno Vailati Producer Salvatore Billitteri Film Editing