Tromaville High School in
New Jersey is located next to a
nuclear power plant. A
nuclear accident at the power plant is covered up by plant owner, Mr. Paley, who does not want the facility shut down by the safety commission. The accident causes a radioactive water leak which ends up gruesomely killing a student named Dewey at the school after the tainted water reaches the drinking fountain. The gang of the school, called "The Cretins," who were originally part of the
honor society, torments the school, and it is implied that they have been turned into violent
psychopaths by the runoff from the plant. They pick leaves from a radioactive
marijuana plant located in the yard of the nuclear plant and sell it to Eddie for $10. At his "indoor bikini beach party" that night, Eddie pressures his friend Warren and Warren's girlfriend Chrissy into smoking the radioactive joint, but it accidentally falls on the floor and is trampled by other party-goers before anyone else can try it. The mutated drug shows itself to have potent
aphrodisiac effects, leading to Warren and Chrissy having sex in Eddie's loft. However, that same night, both of them have disturbing nightmares about hideously mutating, with Warren's penis and Chrissy's stomach growing, though these effects are seemingly gone by morning. Some time later, Chrissy discovers that she is pregnant, and spits out a small creature into a nearby toilet. The creature travels through the water pipes and lands in a barrel filled with
radioactive waste. There it
mutates into a bigger creature. The nuclear Plant orders a lock down of the school, and begins an investigation into Dewey's death. One of the nuclear workers begins to investigate the basement. Though his equipment shows signs of a spill, he can't find any evidence, outside of a foul odor. After hearing for a second time a sound which he had previously dismissed, he investigates. As he is observing a barrel, the monster's arm reaches out and claws his face before killing him. Meanwhile, Warren, tired of the Cretins' constant harassment, ends up going on a radiation-fueled rampage, killing two of them, with no memory of the event once he comes to his senses. The Cretins, expelled from the school and cut off from their customer base, assault the principal and force him to use the school's Radiation Alarm to cause an evacuation, letting the Cretins bar the building and occupy it. In the process of doing this, the Cretins shoot and kill the principal's secretary, who happened to open the door just as the gang was torturing the principal. Capturing Chrissy as bait for Warren, the leader of the gang holds her hostage in the basement and plans to kill her in front of Warren, only to be interrupted by the now adult monster. Warren goes into the school to save her and discovers the adult monster, who kills every one of the Cretins. Warren zaps the creature with a laser from the physics laboratory as he and Chrissy flee the school. Mr. Paley enters the room before the school explodes, killing him and the creature. The students celebrate as the loudspeakers announce that the school will be shut down for remodeling. While reconstruction is taking place, another small creature appears squirming through the remains of the destroyed school. ==Cast==