On a small Caribbean island, an American crew lead by Bart Thompson are blasting the sea bed to build a harbor. In doing so, they accidentally uncover an ice cold underwater pocket where they find perfectly preserved dinosaurs that have been frozen in suspended animation for million years. They remove the beasts to the shore where during a storm at night the beasts are struck by lightning and come back to life. The unsuspecting islanders have no idea that the dinosaurs are alive because of the storm and are now roaming the island. The unscrupulous island manager, Mike Hacker, also finds a Neanderthal man, who is also awakened and befriends a young local orphan island boy named Julio where they get into mischief. Now Bart and the others must find a way to protect themselves from the rampaging beasts.
