Revenge of the Creature

In a tributary of the Amazon, a monster – half-man, half-fish – is captured and placed in a reservoir in a Florida national park to be observed by scientists.

• 
  Jack Arnold
• 
  Fred Frank

• 
  John Agar
  Prof. Clete Ferguson
• 
  Lori Nelson
  Helen Dobson
• 
  John Bromfield
  Joe Hayes
• 
  Nestor Paiva
  Captain Lucas
• 
  Grandon Rhodes
  Jackson Foster
• 
  Dave Willock
  Lou Gibson
• 
  Robert B. Williams
  George Johnson
• 
  Charles Cane
  Police Captain
• 
  Loretta Agar
  Woman on Boat (uncredited)
• 
  Bill Baldwin
  Patrol Boat Dispatcher (voice / uncredited)
• 
  Jere Beery
  Photographer (uncredited)
• 
  Ricou Browning
  The Gill Man (in water) / Lab Technician (uncredited)
• 
  Diane DeLaire
  Miss Abbott (uncredited)
• 
  Mike Doyle
  Cop (uncredited)
• 
  Clint Eastwood
  Jennings (uncredited)
• 
  Jack Gargan
  Skipper (uncredited)
• 
  Charles Gibb
  Cop (uncredited)
• 
  Brett Halsey
  Pete (uncredited)
• 
  Don C. Harvey
  Mac - Spotlight Party Leader (uncredited)
• 
  Tom Hennesy
  The Gill Man (on land) / Marineland Diver (uncredited)