John Agar

Dr. Roger Bentley

Cynthia Patrick

Adad

Hugh Beaumont

Dr. Jud Bellamin

Alan Napier

Elinu, the High Priest

Nestor Paiva

Prof. Etienne Lafarge

Phil Chambers

Dr. Paul Stuart

Rodd Redwing

Nazar

Robin Hughes

First Officer

Eddie Parker

Mole Person

Frank Baxter

Self (as Dr. Frank C. Baxter)