Sal Ponti
Demetrios
Joyce Taylor
Princess Antillia
John Dall
Zaren
William Smith
Captain of the Guard
Edward Platt
Azor the High Priest
Frank De Kova
Sonoy the Astrologer
Berry Kroeger
Surgeon
Edgar Stehli
King Kronas
Wolfe Barzell
Petros, Demetrios' Father
Jay Novello
Xandros the Greek Slave
Paul Frees
Narrator / Multiple Voices (voice)
Nestor Paiva
Megalos (uncredited)
John Hart
Nobleman (uncredited)
Phyllis Douglas
Girl (uncredited)
I. Stanford Jolley
Governor of Rivers (uncredited)
Gene Roth
Governor of Animals (uncredited)
Charles Horvath
Nobleman (uncredited)
Charles Cirillo
Slave (uncredited)
George Bruggeman
Guard (uncredited)
Robert 'Big Buck' Maffei
Andex the Giant (uncredited)
Byron Morrow
Governor of the Mountains (uncredited)
Will J. White
Officer (uncredited)
Ralph Smiley
Pavlo (uncredited)
Harry Fleer
Governor of Science (uncredited)
David Dyer
Priest (uncredited)
Alan Callow
Norseman Slave (uncredited)