In the film, Gyllenhaal plays a college professor called Adam who watches a film only to see a man who is his exact double. The poster (from Arrow In The Head) is for the US release, which is set for 24 March.
Enemy co-stars Mélanie Laurent (Inglourious Basterds), Sarah Gadon (Antiviral) and Isabella Rosselini (Blue Velvet).
Enemy is set for release in the UK 7 February. You can buy Donnie Darko on DVD for £2.95 at Amazon.co.uk.