Island of the Fishmen

After their prison ship sinks in the Caribbean, a group of prisoners and a doctor wash ashore on a seemingly deserted island. They soon discover a strange couple, who invite them to stay at their house. While the prisoners plan an escape, the doctor does some investigating, and soon finds out just what the pair are really doing, and why the prisoners keep disappearing mysteriously.

• 
  Sergio Martino
• 
  Steve Jerrom

• 
  Barbara Bach
  Amanda Marvin
• 
  Claudio Cassinelli
  Lt. Claude de Ross
• 
  Richard Johnson
  Edmond Rackham
• 
  Beryl Cunningham
  Shakira
• 
  Joseph Cotten
  Prof. Ernest Marvin
• 
  Franco Javarone
  Jose
• 
  Roberto Posse
  Peter
• 
  Giuseppe Castellano
  Skip
• 
  Franco Mazzieri
  Francois
• 
  Cameron Mitchell
  Decker (US version)
• 
  Mel Ferrer
  Radcliffe (US version)
• 
  Eunice Bolt
  Samantha (US Version)
• 
  Jim Alquist
  James (US version)
• 
  Tom J. Delaney
  Patterson (US version)
• 
  Bobby Rhodes
  Rackham's Servant (uncredited)
• 
  Riccardo Petrazzi
  Prisoner on Lifeboat(uncredited)