sentences:  After ferrying his friends back to the mainland, Morgan returns to investigate.Also thrown into the mix are Thomas and Rita (Tom Stovall and Belinda Balaski), an expecting couple; Jack Bensington (Ralph Meeker), the owner of a dog food company, who hopes to market the substance; and Bensington's assistant Lorna (Pamela Franklin), a bacteriologist.After Morgan locates and dynamites the giant wasps' enormous nest, he and the others become trapped in the Skinner's farmhouse, surrounded by giant rats.