When explosions from dynamite uncover two prehistoric monsters and the body of a caveman, the construction crew bring the bodies ashore and decide what to do with them.
Lightning strikes the bodies and revives them and the begin stalking the island. A young boy befriends the caveman and a Brontosaurus but the real problem is the T-Rex. The effects are stop motion animation and they look good for the budget of the film.
This is made by the people who brought us "The Blob" and they wanted Steve McQueen to star, but he was so difficult to work with while making the aforementioned film they just decided not to bother. However, I love this film and would recommend it to anyone. A harmless 80 minutes.