1960 horror/adventure movie "classic"
While taking their boat out for some water-skiing, a quartet of teens named Reg (Don Sullivan), Skip (Paul Pepper), Julie (Mitzie Albertson), and Pam (Brianne Murphy) accidentally discover an island run by a mad scientist named Doctor Myra (Katherine Victor) who, backed by foreign agents from "the East", intends to turn everyone in the United States into mindlessly obedient zombies.
The teenagers are captured by the hulking, bearded zombie Ivan (Chuck Niles) and imprisoned in cages down in Myra's basement, but the boys manage to escape, planning to find a way off the island and then come back to rescue the girls. When a couple of their young friends arrive with the local sheriff to save them, he turns out to be in league with Myra and has been supplying her with victims for her experiments.
A complicated fight scene serves as the climax, in which a previously zombified gorilla arrives just in time to attack Myra's henchmen and allow the teens to escape. When they are safely back on the mainland and the proper authorities informed, it is implied that the teens will receive a reward for discovering the island and will have an audience with the President of the United States.
Directed by Jerry Warren Don Sullivan as Reg Katherine Victor as Dr. Myra Steve Conte as Whorf J.L.D. Morrison as Brandt Brianne Murphy as Pam Paul Pepper as Skip Mitzie Albertson as Julie
Text from wikipedia