Edward Connell
饰 David Fielding
Barbara Hewitt
饰 Susan Turner
Frank Bonner
饰 Jim Hudson
Robin Christopher
饰 Vicki
James Phillips
饰 Reporter Sloan
Fritz Leiber Jr.
饰 Dr. Arthur Watermann
Patrick Burke
饰 Doctor Branson
Louis Clayton
饰 Old man in cave
James Dwion
饰 The Orderly
Forrest J. Ackerman
饰 Doctor on Tape Recorder (voice) (uncredited)
Jack H. Harris
饰 Detective Harrison (uncredited)
Chuck Niles
饰 Reporter Sloan (voice) (uncredited)
Jim Duron
饰 The Green Giant
