Calificación
Reparto

Frank Bonner
Jim Hudson (as Frank Boers Jr.)

Edward Connell
David Fielding (as Skip Shimer)

Barbara Hewitt
Susan Turner

Robin Christopher
Vicki (as Robin Snider)

Fritz Leiber Jr.
Dr. Arthur Watermann (as Fritz Leiber)

Louis Clayton
Old man in cave

James Phillips
Reporter Sloan (as Jim Phillips)

Patrick Burke
Doctor Branson

Sharon Gray
Nurse

Jim Duron
The Green Giant