Popcorn (1991)

A "Leatherface" type murderer who wears other people's faces, kills at an all-night horrorthon at an old theatre put on by a bunch of film students. Maggie, the lead character, believes it's really Lanyard Gates, a crazed film maker who killed his family live on stage, fifteen years ago. And now he's back to kill his daughter, Sara, who is believed to be really Maggie.