On a remote island in the Pacific a group of scientist are sent on search to find a another expedition group that have disappeared off the island. The purpose of their research was to discover the effects of nuclear radiation (after nuclear weapon tests conducted on the island) on the animals and plants on the island however they discover the island is now inhabited by giant mutated crabs! The crabs have not only killed the last group of the last expedition but they also have gained their intelligence. They also plan on killing all of the crew of this latest expedition and destroying the island as well. Produced and directed by the legendary king of the B-Movies Roger Corman.