Edward Connell

David Fielding (as Skip Shimer)

Acting

Barbara Hewitt

Susan Turner

Acting

Jack Woods

Asmodeus

Sound

Frank Bonner

Jim Hudson (as Frank Boers Jr.)

Acting

Robin Christopher

Vicki (as Robin Snider)

Acting

James Phillips

Reporter Sloan (as Jim Phillips)

Acting

Fritz Leiber Jr.

Dr. Arthur Watermann (as Fritz Leiber)

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