Mexican director Rene Cardona directs this 1968 superhero caper about beautiful crime-fighting luchador known as Batwoman! After the body of a professional wrestler is found off Acapulco’s coastline, the victim, by all appearances, is believed to have drowned. However, the autopsy reveals a very perplexing and disturbing prognosis, when it’s discovered the victim’s pineal gland has been surgically drained of all fluid. With this prognosis eerily imitating the findings in the autopsies of murdered victims in Hong Kong and Macao, the police turn the investigation over to Mario Roble, who enlists the help of a Batwoman. Their thorough investigation leads them to an evil neurosurgeon who is using the fluid in his endeavors to genetically engineer a half-fish, half-man hybrid.