The premise of the film opens with Tammy at cheerleader practice, while her boyfriend Michael walks in from football practice to observe. The two of them meet Byron, Tammys homosexual friend, who approves of Michael as her new boyfriend. Shortly thereafter, Tammy's violent and jealous ex boyfriend Billy arrives with his gang and harass Michael. A violent fight erupts between Billy and Michael, with Billy gaining the upper hand by grabbing Michael by his testicles and not letting go. Michael retaliates by grabbing Billy by his testicles in the same fashion. The police arrive to break up the fight and get the two boys to release the grip on one another, with Billy clearly in pain, but Michael unfazed due to his wearing a protective cup. The police take Billy into custody, but Tammy, unable to deal with the events, breaks down and runs away in tears.
The scene then cuts to a figure of a t-rex in a dark wearhouse as two people, Dr. Wachenstien and his assistant Helga, walk through the doors. The lights come on and the t-rex figure begins to move, being controlled by someone in a room. The Dr. is impressed by the robotic dinosaurs strength, and reveals his plan to implant a living human brain into the robot to give it consciousness, mobility and, "immortality".
Later that night, Michael sneaks out to see Tammy. They are soon interupted by Billy and his thugs, who chase and catch Michael. They throw him into the wild Animal Park where lions and jaguars run loose. A lion mauls Michael and he is left in a comatose state. He is brought to a hospital where his intoxicated uncle watches over him. Dr. Wachenstein and Helga declare Michael dead so they can use his brain to control their robotic t-rex. After his brain is installed, Michael escapes and wreaks vengeance on his high school tormentors and is reunited with his sweetheart Tammy. She realizes the dinosaur is Michael and begins a search to find a more suitable body for him. However Dr. Wachenstein is in hot pursuit of his creation. This leads to a chase scene that ends with Michael killing the doctor. Police officers open fire and destroy the mechanical dinosaur. Tammy manages to recover Michael’s brain. In the end she takes it home with her and hooks his brain up to her computer, speakers and video camera which is temporary until they find a new body for him. Through the set up Michael is able to speak and see, which allows him to view Tammy performing a striptease. This causes the brain hookups to spark.