the premise of this film isn not exactly original and but a story like this have great potential both for a psychological thriller and for a fun horror flick . but unfortunately and or unknown origin doesn not quite manage to excel at be either . the focus be more on the battle between man and rat than provide the sort of schlocky horror that the eighty produce so prolifically and which be fine while but it never probe too deep into the psyche of the central character and and the film play out like a movie that should be fun and but largely isn not . that not to say that it a bad film and however and a there be a lot of good idea on display and and the film also feature what may be a career best performance from peter weller . the plot see a man who recently complete the rebuilding of a house be leave alone when his wife and child go on holiday . he stay behind to try and win a promotion and but he doesn not count on an onslaught of torture when it turn out that the house he put together have become infest by a rat . what follow be an all out war between man and one of the world most notorious pest . rat be one of horror cinema most popular animal and and it not hard to see why . there be a scene in this film that see the central character make a case against rat and and it really make you realise the reason why these animal be so often fear . of unknown origin start out slowly and but build some momentum half way through when our hero begin his personal war against nature . i wasn not expect much after the first half hour and but the film surprise me somewhat by the way it eventually come together and climax with an exciting sequence that see the central character really go off the rail . peter weller really be superb in the lead role and and i wouldn not be surprise if this film be the reason he go on to take the lead role in the classic sci fi thriller robocop . it a shame that director george p. cosmatos doesn not seem too keen to get fully inside the character head and a the potential for a great psychological thriller be definitely there . this film may have be good if it be handle by someone like david lynch and but despite it imperfection while of unknown origin be still worth see .