In the swamp near the town, a lumberjack saw a giant monster, but no one believed them. Later, Dave Walker decided that his cheating wife was messing with his lover Carl Morton. He chased them through the swamp and forced them to jump into the water, and leeches swarmed in. Dave was shocked, arrested and charged with murder. The other two locals decided to look for the body and disappeared into the swamp. Finally, Sheriff Steve had to personally look for and try to destroy these deadly leeches in order to restore peace to the town.