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Of Unknown Origin
- Tahun: 1983
- Negara: Canada, United States of America
- Genre: Horror
- Studio: Canadian Film Development Corporation, Famous Players Limited, Warner Bros. Pictures, Les Productions Mutuelles Ltée
- Kata kunci: new york city, based on novel or book, poison, animal attack, house, rampage, rat, canuxploitation, animals gone wild, giant rat, mousetrap
- Pengarah: George P. Cosmatos
- Pelakon: Peter Weller, Jennifer Dale, Lawrence Dane, Kenneth Welsh, Louis Del Grande, Shannon Tweed