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He Knows You're Alone
- Tahun: 1980
- Negara: United States of America
- Aliran: Kengerian
- Studio: Metro-Goldwyn-Mayer, Lansbury/Beruh Productions
- Kata kunci: insanity, detective, shower, blackout, bride, stalker, murder, urban legend, decapitation, serial killer, maniac, stripping, psycho killer, funhouse, dance studio, stabbed to death
- Direktur: Armand Mastroianni
- Pemeran: Caitlin O'Heaney, Elizabeth Kemp, Dana Barron, Don Scardino, Tom Hanks, James Rebhorn