The film, which stars Terry Kiser, Ellen Dubin, Denise Richards, Paul Walker, George Pilgrim, and John Franklin, centers around a high school student named Tammy, whose boyfriend Michael has his brain implanted in the body of a robotic Tyrannosaurus rex by a mad scientist.

Shortly thereafter, Tammy's violent and jealous ex-boyfriend Billy arrives with his gang and harasses Michael; a fight erupts between the two.

The scene then cuts to a figure of a Tyrannosaurus rex in a dark warehouse as two people, Dr. Wachenstein and his assistant Helga, walk through the doors.

Dr. Wachenstein and Helga declare Michael dead, so that they can use his brain to control their robotic Tyrannosaurus rex.

After his brain is implanted, Michael escapes and wreaks vengeance on his high school tormentors and is reunited with his sweetheart Tammy.

Dr. Wachenstein is in hot pursuit of his monstrous creation, which leads to a chase that ends with Michael killing the doctor.

[1] Stewart Raffill says that he was approached by a man who owned theatres in South America who had an animatronic T-Rex which was going to a park in Texas: "The eyes worked.

"[2] During production, one of the actors portraying one of the bumbling cops had a heart attack on set and required medical attention.

[citation needed] Originally filmed as an R-rated comedy horror, its gore scenes were removed from its initial American release in order to appeal to a broader audience.

In 2019, Vinegar Syndrome restored and theatrically released the 90 minute uncut version in select North American theaters.