- Country: USA
- Genres: Drama, Mystery, Thriller
- Release: 1982-09-10
- Director: Alan Rudolph
- Writers: Judd Klinger , Richard Clayton Woods , John Binder
- Language: English
- Stars: Robert Urich , JoBeth Williams , Paul Dooley , Hoyt Axton
- Runtime: 97 min
- Awards: 1 nomination.
- AKA: Especies asesinas (Spain) , L'esperimento (Italy) , La amenaza desconocida (Mexico) , A Morte Vem do Céu (Brazil) , Endangered Species (United Kingdom) , S.W.O.C. (United States of America) , Tuntematon uhka (Finland) , 真夜中の極秘実験 (Japan) , Угроза исчезновения видов , Endangered Species (United States of America) , Der schleichende Tod , Skjult trussel (Norway) , Endangered Species (Canada) , Espèce en voie de disparition (France, French Republic) , Cows (United States of America) , Der Tod aus dem Nichts , Ο σπεσιαλίστας (Greece) , Vem hotar oss? (Sweden) , Endangered Species , Especies en peligro (Mexico) , Specii pe cale de dispariţie (Romania) , Zagrozony gatunek (Poland)
- Plot: Thriller about a New York ex-cop and an attractive female sheriff who fall in love while investigating a string of mysterious cattle mutilations in a small Colorado town. Urich is great as Reuben Castle, the retired alcoholic police lieutenant out visiting the town with his tomboy daughter. At first he tries to stay out of the case but finds himself involved after the mysterious death of his friend Joe Hiatt, the editor of the local paper whose theories about black helicopters have aroused the ire of cattle baron Ben Morgan. Trying miserably to stay sober, Castle finds himself back in danger and in love, as he and the sheriff work together to get to the bottom of the mystery, encountering incredible danger and resistance from the frightened locals.
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