John Agar as Dr. Roger Bentley

Cynthia Patrick as Adad

Hugh Beaumont as Dr. Jud Bellamin

Alan Napier as Elinu, the High Priest

Nestor Paiva as Prof. Etienne Lafarge

Phil Chambers as Dr. Paul Stuart

Rodd Redwing as Nazar

Robin Hughes as First Officer

Eddie Parker as Mole Person

Frank Baxter as Self (as Dr. Frank C. Baxter)

Robert F. Hoy as Mole Person

Joe Abdullah as

Yvonne de Lavallade as

John Dodsworth as

Arthur D. Gilmour as

Marc Hamilton as

Bob Herron as

Kay E. Kuter as

James Logan as

Billy Miller as

Joe Rubino as

Patrick Whyte as