The teenagers set up camp at a lake, but after a few hours, Tom and Beth disappear. Sandy and Greg go looking for them and discover their bodies in an abandoned shack. They drive away in their van, while being attacked by one of the jellyfish which tries to get through the car's windshield. After they get rid of it, they arrive at the truck stop. Greg tries to get help from the locals, but they do not believe him, except for Fred 'Sarge' Dobbs (Martin Landau), who is a mentally ill veteran. Meanwhile, Sandy encounters the humanoid and flees into the woods, where Joe Taylor finds and returns her to Greg.
