• 
  George Pal

  regizor

• 
  Daniel Mainwaring

  scenarist

• 
  Joyce Taylor

  Princess Antillia
• 
  John Dall

  Zaren
• 
  Sal Ponti

  Demetrios
• 
  Edward Platt

  Azor the High Priest
• 
  I. Stanford Jolley

  Governor of Rivers
• 
  Nestor Paiva

  Megalos

• 
  Jack Shea

  Governor of the Air
• 
  Berry Kroeger

  Surgeon
• 
  Edgar Stehli

  King Kronas
• 
  Roy Jenson

  Paznic
• 
  Charles Horvath

  Nobleman
• 
  Jay Novello

  Xandros the Greek Slave
• 
  Wolfe Barzell

  Petros, Demetrios' Father

• 
  Frank DeKova

  Sonoy the Astrologer
• 
  Paul Frees

  Narrator / multiple voices (voice)
• 
  William Smith

  Captain of the Guard
• 
  Joyce Taylor

  Princess Antillia

• 
  Gerald Hargreaves

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