Don McGuire
— Congo Bill
Cleo Moore
— Lureen / Ruth Culver
Jack Ingram
— Cameron
I. Stanford Jolley
— Bernie MacGraw
Nelson Leigh
— Dr. Greenway
Charles King
— Kleeg
Armida
— Zalea
Hugh Prosser
— Morelli
Neyle Morrow
— Kahla
Fred Graham
— Villabo
Rusty Wescoatt
— Ivan
Anthony Warde
— Rogan
Stephen Carr
— Tom MacGraw
William Fawcett
— Blinky
Frank Lackteen
— Nagu
Knox Manning
— Narrator
Frank O'Connor
— Frank
Eddie Parker
— Torturer
Stanley Price
— Nagu's Friend
Wally West
— Circus Henchman
Leonard Penn
— Andre Bocar