Dr. Paul Kettering
Ed Nelson
Alice Summers
Joanna Lee
Zombie (uncredited)
Hampton Fancher
Professor Cole
Leonard Nimoy
Doctor
Doug Banks
Prof. Helsingman
Saul Bronson
Senator Walter K. Powers
Cornelius Keefe
Glenn Cameron
Alan Jay Factor
Elaine Cameron
Jody Fair
Dr. Wyler
David Hughes
Dan Walker
Robert Ball
Sheriff
Phil Posner
Mayor Cameron
Orville Sherman
Telegrapher
Henry Randolph
Executive Producer
Roger Corman
Music
Sergei Prokofiev
Producer
Dmitri Shostakovich
Director
Bruno VeSota
Original Film Writer
Robert A. Heinlein
Screenplay
Gordon Urquhart
Associate Producer
Stanley Bickman
Art Direction
Burt Shonberg
Makeup Artist
Alan Trumble
Director of Photography
Lawrence Raimond
Editor
Carlo Lodato
Production Manager
F. Amos Powell
Assistant Director
Mike Murphy
Music Supervisor
Tom Jonson
Sound
James Fullerton