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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
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