Carl Denham escapes trouble in New York by getting on a ship bound for a distant land. He gets into a fight and is made to disembark on Skull Island where he alights on a smaller version of King Kong.
Paul Lavond is framed for murder and robbery by his associates and sent to the Devil's Island. Years later, when Paul escapes with the help of a scientist, he vows vengeance on his associates.
A rescue team is sent to Mars to bring back an astronaut who claims that a Martian monster killed his team. As they return to Earth, they sense the presence of the creature in the spaceship.