A giant alligator runs riot in a small town with a lake connected to a sewer/drainage system. Typical plot; nobody believes the sightings until lots of people have been killed.

Some fishermen are attacked in the Louisiana swamps. When the word gets out of a mysterious Bigfoot-type creature, two researchers come to a small town to study and hopefully discover what the beast is. Their research from some farmers help the two men to learn that the creature may be a very angry and murderous missing link.