The Batwoman

Gloria, a wealthy and skilled female wrestler, is called to investigate a series of murders of wrestlers whose pineal glands have been removed. She teams up with FBI agent Mario Robles to uncover the truth behind the crimes, leading them to a neurosurgeon named Dr. Eric Williams who is experimenting with creating a gilled human by injecting fish with the glandular extract. Williams plans to create an army of Gill Men to control the world's oceans, using wrestlers as donors due to their vigor. Gloria and Mario stake out a local wrestling gym to catch the next victim, and once Williams is identified, Gloria infiltrates his boat, only to be nearly caught and eventually targeted by a Gill Man.