Laserblast

In this campy sci-fi classic, misfit teen Billy Duncan (Kim Milford) leads a miserable existence. That changes, however, when Billy finds a laser gun abandoned in the desert by a pair of aliens. Now, Billy has the supernatural powers that will enable him to get back at his enemies. He soon discovers, however, that each time he fires the gun, he begins to mutate -- turning little by little into an alien himself.