Stingray: Monster from the Deep (2)

Commander Shore's old enemy, Conrad Hagen, is out of prison and back on the loose with his beautiful but devious daughter, Helga. When they hijack a World Aquanaut Security Patrol vessel and kidnap Atlanta, it's up to Captain Troy Tempest and the crew of Stingray to save her. But first, they will have to uncover the mystery of the treasure of Sanito Cathedral and escape the fury of the monster from the deep.

Based on the 1966 novel Stingray and the Monster by John Theydon.