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Of Unknown Origin (1983)

1:26 | Trailer
A man becomes destructively obsessed with killing a dangerous rat, which has taken residence in his, recently renovated, house.


George P. Cosmatos


Chauncey G. Parker III (novel), Brian Taggert (screenplay)
2 wins. See more awards »





Cast overview, first billed only:
Peter Weller ... Bart Hughes
Jennifer Dale ... Lorrie Wells
Lawrence Dane ... Eliot Riverton
Kenneth Welsh ... James Hall
Louis Del Grande Louis Del Grande ... Clete
Shannon Tweed ... Meg Hughes
Keith Knight ... Hardware Salesman
Maury Chaykin ... Dan Errol
Leif Anderson ... Peter Hughes
Jimmy Tapp Jimmy Tapp ... Meg's Father
Gayle Garfinkle Gayle Garfinkle ... Janis Wycoff
Earl Pennington Earl Pennington ... Mr. Thompson
Jacklin Webb Jacklin Webb ... Newspaper Vendor
Bronwen Mantel Bronwen Mantel ... Florence Riverton
Monik Nantel Monik Nantel ... Secretary


Bart Hughes has a pretty good life, a beautiful wife, a young son, a good job with promotion prospects, and a renovated brownstone in New York. When wife and kid leave for a vacation, Bart stays behind to work on a project that will earn him that promotion, unaware that a certain inhabitant of his basement has other plans for his time. Bart goes a bit bonkers trying to kill this rat, destroying most of his house in the process. Certain allegorical elements tie the household conflict to the "rat race" in his office, but the main event is certainly the night-and-day contest of wills between man and rodent. Written by Chris Holland <stomptokyo@aol.com>

Plot Summary | Add Synopsis


Peter Weller (Robocop) Turns his home into a battleground against an enemy... See more »


Horror | Thriller


R | See all certifications »

Parents Guide:

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Did You Know?


Actress Shannon Tweed received an 'introducing' credit. See more »


Bart Hughes: [Bart is setting traps] Watch and weep, you furry fucker.
See more »


Featured in That Rat Movie! (2018) See more »

User Reviews

Imperfect, but effective little thriller
2 October 2006 | by The_VoidSee all my reviews

The premise of this film isn't exactly original, but a story like this has great potential both for a psychological thriller and for a fun horror flick...but unfortunately, Or Unknown Origin doesn't quite manage to excel at being either. The focus is more on the battle between man and rat than providing the sort of schlocky horror that the eighties produced so prolifically, which is fine; but it never probes too deep into the psyche of the central character, and the film plays out like a movie that should be fun, but largely isn't. That's not to say that it's a bad film, however, as there are a lot of good ideas on display, and the film also features what may be a career best performance from Peter Weller. The plot sees a man who recently completed the rebuilding of a house being left alone when his wife and child go on holiday. He stays behind to try and win a promotion, but he doesn't count on an onslaught of torture when it turns out that the house he put together has become infested by a rat. What follows is an all out war between man and one of the world's most notorious pests.

Rats are one of horror cinema's most popular animals, and it's not hard to see why. There is a scene in this film that sees the central character make a case against rats, and it really makes you realise the reason why these animals are so often feared. Of Unknown Origin starts out slowly, but builds some momentum half way through when our hero begins his personal war against nature. I wasn't expecting much after the first half hour, but the film surprised me somewhat by the way it eventually comes together, climaxing with an exciting sequence that sees the central character really go off the rails. Peter Weller really is superb in the lead role, and I wouldn't be surprised if this film was the reason he went on to take the lead role in the classic Sci-Fi thriller 'Robocop'. It's a shame that director George P. Cosmatos doesn't seem too keen to get fully inside the character's head, as the potential for a great psychological thriller is definitely there. This film may have been better if it was handled by someone like David Lynch, but despite its imperfections; Of Unknown Origin is still worth seeing.

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Canada | USA



Release Date:

24 November 1983 (USA) See more »

Also Known As:

Of Unknown Origin See more »

Filming Locations:

Montréal, Québec, Canada


Box Office


$4,000,000 (estimated)

Opening Weekend USA:

$540,446, 27 November 1983

Gross USA:


Cumulative Worldwide Gross:

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Company Credits

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Technical Specs


Sound Mix:




Aspect Ratio:

1.85 : 1
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