Lloyd Nolan is back as detective Michael Shayne who's in search of a stolen coin.

During World War II, an American bomber pilot is rescued after drifting at sea aboard a raft. After being administered truth serum, he tells the doctor a story of how he and the three survivors of his plane crash washed up on an island that was inhabited by a tribe of beautiful primitive cave-women, dinosaurs and a group of savage cavemen who are bent on abducting the women for breeding purposes.

During World War II Stan and Ollie find themselves as improbable bodyguards to an eccentric inventor and his strategically important new bomb.