Terror Beneath the Sea

While covering a test of guided torpedoes, two reporters believe they see what appears to be a strange-looking swimming creature. They investigate the matter further and discover that there is a race of fish-men living under the sea. The fish-men capture the pair and keep them prisoner in their underwater city.

• 
  Hajime Sato
• 
  Goro Hanawa

• 
  Sonny Chiba
  Ken Abe
• 
  Peggy Neal
  Jenny Gleason
• 
  Franz Gruber
  Commander Brown
• 
  Andrew Hughes
• 
  Erik Neilson
  Dr. Moore
• 
  Mike Daneen
  Dr. Josef Heim
• 
  Beverly Keller
• 
  Gunther Braun
  Submarine captain
• 
  Koji Miemachi
• 
  Tadashi Suganuma
  Nishida
• 
  Hideo Murota
  Henchman
• 
  Osamu Yamanouchi
• 
  Kosaku Okano
  Nakamura
• 
  Ichiro Mizuki
• 
  Akemi Fuji
  Female researcher
• 
  Enver Altenbay
• 
  Hans Horneff
  Bill
• 
  Steve Queens
  Captain Bob