"Tammy is a popular high school cheerleader whose new boyfriend, Michael, might be the love of her life. But Tammy's jealous ex, Billy, won't stand for anyone coming between him and 'his' girl, so he and his friends kidnap Michael, leaving him to be mauled by a lion in a local wildlife reserve. Comatose and at death's door, Michael's body is stolen from the hospital by mad scientist Dr. Wachenstein, who extracts his brain and implants it into a giant robotic T-Rex. Horrified by his predicament and new dinosaur body, he escapes from the doctor's lab and begins brutally killing his former bullies. Meanwhile Tammy and her best friend Byron start searching for a suitable human corpse in which to re-transplant Michael's brain