Release calendarTop 250 moviesMost popular moviesBrowse movies by genreTop box officeShowtimes & ticketsMovie newsIndia movie spotlight
    What's on TV & streamingTop 250 TV showsMost popular TV showsBrowse TV shows by genreTV news
    What to watchLatest trailersIMDb OriginalsIMDb PicksIMDb SpotlightFamily entertainment guideIMDb Podcasts
    OscarsEmmysToronto Int'l Film FestivalHispanic Heritage MonthIMDb Stars to WatchSTARmeter AwardsAwards CentralFestival CentralAll events
    Born todayMost popular celebsCelebrity news
    Help centerContributor zonePolls
For industry professionals
  • Language
  • Fully supported
  • English (United States)
    Partially supported
  • Français (Canada)
  • Français (France)
  • Deutsch (Deutschland)
  • हिंदी (भारत)
  • Italiano (Italia)
  • Português (Brasil)
  • Español (España)
  • Español (México)
Watchlist
Sign in
  • Fully supported
  • English (United States)
    Partially supported
  • Français (Canada)
  • Français (France)
  • Deutsch (Deutschland)
  • हिंदी (भारत)
  • Italiano (Italia)
  • Português (Brasil)
  • Español (España)
  • Español (México)
Use app
  • Cast & crew
  • User reviews
  • Trivia
  • FAQ
IMDbPro

Of Unknown Origin

  • 1983
  • R
  • 1h 28m
IMDb RATING
6.1/10
4.2K
YOUR RATING
Shannon Tweed and Peter Weller in Of Unknown Origin (1983)
Official Trailer
Play trailer1:26
1 Video
56 Photos
Dark ComedyPsychological HorrorHorrorThriller

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

  • Director
    • George P. Cosmatos
  • Writers
    • Brian Taggert
    • Chauncey G. Parker III
  • Stars
    • Peter Weller
    • Jennifer Dale
    • Lawrence Dane
  • See production info at IMDbPro
  • IMDb RATING
    6.1/10
    4.2K
    YOUR RATING
    • Director
      • George P. Cosmatos
    • Writers
      • Brian Taggert
      • Chauncey G. Parker III
    • Stars
      • Peter Weller
      • Jennifer Dale
      • Lawrence Dane
    • 54User reviews
    • 64Critic reviews
    • 51Metascore
  • See production info at IMDbPro
    • Awards
      • 2 wins total

    Videos1

    Of Unknown Origin
    Trailer 1:26
    Of Unknown Origin

    Photos56

    View Poster
    View Poster
    View Poster
    View Poster
    View Poster
    View Poster
    View Poster
    + 49
    View Poster

    Top cast19

    Edit
    Peter Weller
    Peter Weller
    • Bart Hughes
    Jennifer Dale
    Jennifer Dale
    • Lorrie Wells
    Lawrence Dane
    Lawrence Dane
    • Eliot Riverton
    Kenneth Welsh
    Kenneth Welsh
    • James Hall
    Louis Del Grande
    • Clete
    Shannon Tweed
    Shannon Tweed
    • Meg Hughes
    Keith Knight
    Keith Knight
    • Hardware Salesman
    Maury Chaykin
    Maury Chaykin
    • Dan Errol
    Leif Anderson
    Leif Anderson
    • Peter Hughes
    Jimmy Tapp
    • Meg's Father
    Gayle Garfinkle
    • Janis Wycoff
    Earl Pennington
    • Mr. Thompson
    Jacklin Webb
    • Newspaper Vendor
    Bronwen Mantel
    • Florence Riverton
    Monik Nantel
    • Secretary
    Aimée Castle
    Aimée Castle
    • Birthday Party Child
    • (as Aimee Castle)
    Jesse Grasis
    • Birthday Party Child
    Tara O'Donnell
    • Birthday Party Child
    • Director
      • George P. Cosmatos
    • Writers
      • Brian Taggert
      • Chauncey G. Parker III
    • All cast & crew
    • Production, box office & more at IMDbPro

    User reviews54

    6.14.1K
    1
    2
    3
    4
    5
    6
    7
    8
    9
    10

    Featured reviews

    Nick_Dets

    Not to be Underestimated!

    This movie is about a large, smart rat threatening to undermine everything a worldly wall street climber (Peter Weller) has worked to create for his world. The movie is like it's clever rat...creeping up with more intelligence than should be expected.

    Great movies work equally on separate levels so that a wide audience can take what they will from it and still enjoy it immensely. Although technically a B-movie punctuated by 80's camp, it is unmistakable that "Of Unknown Origin" is truly special.

    It's unfortunate that this movie has enough unattractive elements to deter a viewer's interest. First of all, it's a "rat movie". When has that ever been a favorable genre? Second of all, Shannon Tweed's involvement, however early in her career, emits an odor of genericness and illegitimacy.

    Don't be turned off by all these potentially fatal bad traits. Director George P. Cosomotos and Peter Weller had an interesting, artful collaboration going on in "Of Unknown Origin". The film has a tight focus on theme and story, and goofy, highly entertaining, cult-status-worthy performance bits from Weller. It's a fun film- there's no doubt about that. There may be cheese, but there's also sincerity in how the film refuses to take itself seriously. Also, the familiar moral of the story is shown in so fresh a form that you won't even care.

    For a story that works so well on an intellectual level, it's a blessing that the actual rat combat scenes are a great time. As Weller's lost yuppie starts to lose his sanity, his battles with his furry foe become more and more extravagant. Let's just say the conclusion is incredible.

    The title refers to the clouded evolution of rats. It also speaks of the burning, unavoidable core of our hearts that is pure and determined to defeat our dark sides. Our consciences? Our God? Or is it just a fear of a big friggin' rat? Ponder that if you'd like, but enjoy "Of Uknown Origin" regardless.
    6casso

    Humour and irony make it good

    Frankly, I was surprised to know that this movie was directed by George Cosmatos, the creator of such action films as Rambo-2 and Cobra. `Of Unknown Origin' is an absolutely different one. I found it interesting and amusing. It has everything that every good horror film should have – the spirit of suspense. Of course, Peter Weller acts very convincing. I think the movie wouldn't have its strange and surrealistic atmosphere without his talent of acting. The most remarkable episodes include one with Weller talking about the problem of rats in the US during the dinner with his boss. But as a whole I would say that what makes `Of Unknown Origin' a good movie is humour and irony, which one can easily trace from the beginning till the end. I would recommend this film for those who like horror movies not only because of special effects.
    8Vampenguin

    Peter Weller's almost one man show

    Though I don't really consider it a horror film, if you are one of many who happens to be afraid of rodents this film will terrify you. Hell, even you you don't mind rodents it might freak you out a bit. Peter Weller is always a great actor, and he stars in this film as Bart, a man who wages an all out war with one hell of an angry rat while the rest of his life begins to fall apart because of it. He is the only leading actor in this film, and he carries it almost completely on his own. His dinner table speech about the dangers of rats was both hilarious and a bit unnerving at the same time. I liked how this film was almost self-mocking in parts, though it always kept a straight face about it and never went to far. The rat's point of view shots really show this. The scenes with the rat were all very well done, congrats to whoever trained the rat. The plot was very original, and I liked how smart the rat was. Always a couple steps ahead of poor ol' Bart. I think I jumped a foot when the damn thing came out of the toilet. Last but not least, that was one heck of a bat he made near the end! Overall, this is a great film. Admittedly it's a bit cheesy in places, but it knows what it is and handles itself very well. Highly recommended.

    8.5/10
    8yossarian100

    One of my all time favorites!

    Of Unknown Origin is an overlooked gem of a little movie. Not really a horror film, except that something does indeed go bump in the night, and often too. No, this is more of a psychological drama and Peter Weller bangs one out of the park with his performance as the yuppie forced to go to war with a rat. The movie gets down right primitive and to the point, and it's all Peter Weller and some excellent rat photography. I watch this movie about once a year and it's one of my all time favorites. The film isn't dated and the dvd transfer is good so check it out if you're looking for something a little different, something of quality, and not your normal run of the mill mindless horror flick.
    7The_Void

    Imperfect, but effective little thriller

    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.

    Best Emmys Moments

    Best Emmys Moments
    Discover nominees and winners, red carpet looks, and more from the Emmys!

    More like this

    Razorback
    6.0
    Razorback
    The Sender
    6.0
    The Sender
    TerrorVision
    5.5
    TerrorVision
    Massacre in Rome
    6.5
    Massacre in Rome
    Leviathan
    5.8
    Leviathan
    Sin
    4.8
    Sin
    Eyes of a Stranger
    6.0
    Eyes of a Stranger
    The Boogens
    5.5
    The Boogens
    The Cassandra Crossing
    6.3
    The Cassandra Crossing
    Shadow Conspiracy
    5.0
    Shadow Conspiracy
    Shakedown
    6.0
    Shakedown
    The Manitou
    5.4
    The Manitou

    Related interests

    Phoebe Waller-Bridge and Sian Clifford in Fleabag (2016)
    Dark Comedy
    Daniel Kaluuya in Get Out (2017)
    Psychological Horror
    Mia Farrow in Rosemary's Baby (1968)
    Horror
    Cho Yeo-jeong in Parasite (2019)
    Thriller

    Storyline

    Edit

    Did you know

    Edit
    • Trivia
      Debut cinema movie of actress Shannon Tweed.
    • Quotes

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

    • Connections
      Featured in Trailer Trauma 3: 80s Horrorthon (2017)

    Top picks

    Sign in to rate and Watchlist for personalized recommendations
    Sign in

    FAQ20

    • How long is Of Unknown Origin?Powered by Alexa

    Details

    Edit
    • Release date
      • November 23, 1983 (United States)
    • Country of origin
      • Canada
    • Language
      • English
    • Also known as
      • Nepoznato porijeklo
    • Filming locations
      • Montréal, Québec, Canada
    • Production companies
      • Warner Bros.
      • Canadian Film Development Corporation (CFDC)
      • Famous Players Limited
    • See more company credits at IMDbPro

    Box office

    Edit
    • Budget
      • $4,000,000 (estimated)
    • Gross US & Canada
      • $1,080,470
    • Opening weekend US & Canada
      • $540,446
      • Nov 27, 1983
    • Gross worldwide
      • $1,080,470
    See detailed box office info on IMDbPro

    Tech specs

    Edit
    • Runtime
      • 1h 28m(88 min)
    • Color
      • Color
    • Sound mix
      • Mono
    • Aspect ratio
      • 1.85 : 1

    Contribute to this page

    Suggest an edit or add missing content
    • Learn more about contributing
    Edit page

    More to explore

    Recently viewed

    Please enable browser cookies to use this feature. Learn more.
    Get the IMDb App
    Sign in for more accessSign in for more access
    Follow IMDb on social
    Get the IMDb App
    For Android and iOS
    Get the IMDb App
    • Help
    • Site Index
    • IMDbPro
    • Box Office Mojo
    • License IMDb Data
    • Press Room
    • Advertising
    • Jobs
    • Conditions of Use
    • Privacy Policy
    • Your Ads Privacy Choices
    IMDb, an Amazon company

    © 1990-2025 by IMDb.com, Inc.