Return of the Living Dead III

A teenager steals a security key card from his father, a military colonel, to sneak into the base where he works. He witnesses a top-secret experiment to revive corpses for combat, but the project fails and the zombies escape, craving human brains. The teenager and his girlfriend flee, but when she dies in a motorcycle accident, he uses his father's card to bring her back to life using the same experiment. However, his actions cause chaos and his girlfriend's hunger for human brains becomes a growing problem.