Captain Mephisto and the Transformation Machine 1945 (OTS) torrent

a.k.a. Manhunt on Mystery Island

Plot: A mad genius seeks to conquer the world using a Transformation Machine to
disguise himself as "the legendary" pirate Captain Mephisto. To do so,
he kidnaps a scientist resulting in the scientists daughter with her
fiance attempting to rescue him and stop the evil "Captain Mephisto".

--or--

A young couple journeys to Mystery Island to rescue the girl's father, who is being held prisoner by the evil Captain Mephisto, a pirate from 200 years ago who uses his Transformation Machine to travel forward in time and disguise himself as one of the four owners of Mystery Island.
- Written by Anonymous

--or--

A breakthrough scientific device will revolutionize the world's energy usage if the kidnapped inventor can be found. To rescue her father, Claire Forrest enlists the help of ace sleuth Lance Reardon. Clues lead them to a Pacific isle, where the two confront sinister and astonishing forces. The descendants of a long-dead pirate, Mephisto are holding the scientist for their own nefarious gain. And one of the heirs has a 'transformation chair' that changes him into the molecular duplicate of Captain Mephisto.
- Written by Oscars