He Knows You're Alone is a 1980 American horror film directed by Armand Mastroianni, written by Scott Parker and edited by George Norris. It was one of the first horror films to be influenced by the success of 1978's Halloween and shares a number of similarities with that previous hit. A young bride is murdered on her wedding day by the man she rejected for her current fiancé Len, a police detective. Several years later the killer starts a crime spree, murdering brides to be. Len believes the killer of his fiancè has returned and tracks the crimes. The killer stalks bride to be Amy,... and her friends from college, Nancy and Joyce. Amy is having second thoughts about her planned marriage. Her ex-boyfriend Marvin returns and tries to rekindle their relationship. The film was shot entirely in Staten Island New York, and the entire production from script to final edit taking only six months to complete, with only 15 days of filming in between. The original music score was composed by Alexander and Mark Peskanov. The film marked the first movie appearance of actor Tom Hanks who played a relatively small part.
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| Release date: | September 12, 1980 |
| Directed by: | Armand Mastroianni |
| Rated: |  |
| Runtime: | 94 Minutes |
| Producer: | George Manasse |
| Music by: | Alexander Peskanov, Mark Peskanov |
| Screenplay by: | Scott Parker |