Top Cast
John Carradine
Prof. Millard Wyman
Robert Clarke
Craig Randall
Phyllis Coates
Dale Marshall
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Allen Windsor
Paul Whitmore
Sheila Noonan
Lauri Talbott
George Skaff
Dr. J.R. Matheny
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Maurice Bernard
Old Man in the Caverns
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Joe Maierhouser
Jim Wyman
Lloyd Nelson
Wilson, Sonar Man
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Harry Raven
The Captain
