El imperio de las hormigas (1977)

A ship dumps barrels of radioactive waste material into the sea and one of them reaches the beach of the Dreamland Shores enterprise. Sleazy con artist Marilyn Fryser (Joan Collins) and her salesman, partner, and boyfriend Charlie Pearson (Edward Power) lure small-time investors, showing Dreamland Shores as if it were a good place to live and not worthless swampland. When the new group arrives in a boat, Marilyn and Charlie show them the places that will be built. Out of the blue, they are attacked by a colony of large ants and only a few survivors reach a small town. But soon they learn the secret of said town.