John Carradine
Prof. Millard Wyman
Acting
Robert Clarke
Craig Randall
Acting
Phyllis Coates
Dale Marshall
Acting
Allen Windsor
Paul Whitmore
Acting
Sheila Noonan
Lauri Talbott
Acting
George Skaff
Dr. J.R. Matheny
Acting
Maurice Bernard
Old Man in the Caverns
Acting
Joe Maierhouser
Jim Wyman
Acting
Lloyd Nelson
Wilson, Sonar Man
Directing
Harry Raven
The Captain
Acting
Milt Collion
Hank
Acting
Lowell Hopkins
Reporter
Acting
Jack Haffner
Jimmy, Reporter
Art
Robert Carroll
Narrator
Acting