Edward Connell

David Fielding

Acting

Barbara Hewitt

Susan Turner

Acting

Jack Woods

Asmodeus

Sound

Frank Bonner

Jim Hudson

Acting

Robin Christopher

Vicki

Acting

James Phillips

Reporter Sloan

Acting

Fritz Leiber Jr.

Dr. Arthur Watermann

Writing

Patrick Burke

Doctor Branson

Acting

Sharon Gray

Nurse

Acting

Louis Clayton

Old man in cave

Acting

Norvelle Brooks

Acting

Irving L. Lichtenstein

Acting

James Dwion

The Orderly

Acting

Forrest J. Ackerman

Doctor on Tape Recorder (voice) (uncredited)

Acting

Jack H. Harris

Detective Harrison (uncredited)

Production

Chuck Niles

Reporter Sloan (voice) (uncredited)

Acting

Jim Duron

The Green Giant

Acting