• 
  Nathan Juran

  regizor

• 
  Charlotte Knight

  scenarist
• 
  Christopher Knopf

  scenarist

• 
  Frank Puglia

  Dr. Leonardo
• 
  William Hopper

  Col. Robert Calder
• 
  Joan Taylor

  Marisa Leonardo
• 
  John Zaremb

  Dr. Judson Uhl
• 
  Thomas Browne Henry

  Maj. Gen. A.D. McIntosh

• 
  Tito Vuolo

  Police Commissioner Charra
• 
  Rollin Moriyama

  Fermier
• 
  Arthur Space

  Dr. Sharman
• 
  Ray Harryhausen

  Man Feeding Elephant
• 
  Jan Arvan

  Contino - Government Official
• 
  Bart Braverman

  Pepe
• 
  John Zaremba

  Dr. Judson Uhl