Tammy and the T-Rex

An evil scientist implants the brain of Michael, a murdered high school student, into a Tyrannosaurus. He escapes, wreaks vengeance on his high school tormentors, and is reunited with his sweetheart Tammy.
An evil scientist implants the brain of a murdered high school student into an animatronic Tyrannosaurus, who later wreaks vengeance on the bullies who killed him, and is reunited with his sweetheart.