Sandy and Greg are teenagers who go camping, despite warnings not to, with their friends. They soon encounter aliens, who are using the area as a hunting ground.
A Midwestern ingenue arrives in Hollywood to try her luck as an actress. An incompetent agent hooks her up with a production company which specializes in low budget B-movie fair, which starts being plagued by strange, deadly accidents.
Herman Umgar, a German hermit, has an ability to communicate with worms. One day the mayor of the town runs him off his property, so in revenge he plants worms in everybody's food. However, these worms are a special breed of mutant worms from the Red Tide, and when the people eat them they are transformed into giant worms themselves. These worm-people also become Herman's slaves. What will the remaining do?
