When a mysterious substance oozes from the ground, a farmer sees that it acts as a growth hormone and thinks his fortune is made. But when rats, chickens, worms and wasps begin sampling the potent substance, they morph into bloodthirsty giants. Morgan and his friends are on a hunting trip when they are attacked by a swarm of giant wasps, and as they try to escape they discover that the entire island is crawling with of oversized animals.