The Giant Behemoth

Marine atomic tests cause changes in the ocean's ecosystem resulting in dangerous blobs of radiation and the resurrection of a dormant dinosaur which threatens London.

• 
  Gene Evans

  Steve Karnes
• 
  André Morell

  Prof. James Bickford
• 
  Leigh Madison

  Jean Trevethan
• 
  John Turner

  John
• 
  Alastair Hunter

  Dr. C. A. Morris, the village doctor
• 
  Lloyd Lamble

  Senior Admiral, at the Admiralty
• 
  Jack MacGowran

  Dr. Sampson, the paleontologist
• 
  Maurice Kaufmann

  Mini Submarine Officer
• 
  Patrick Jordan

  Photo Lab Aide
• 
  Howard Lang

  Naval Commader, at the "Valkyrie" wreck (uncredited)