It's 'Close Encounters of the Screwball Kind'! 'Shaun of the Dead' co-stars Simon Pegg and Nick Frost are sci-fi geeks whose tour of famous UFO sites is sidetracked when they literally run into an alien. Paul looks like an alien, but acts more like Cheech & Chong. With government agents on their trail, the trio undertakes a madcap journey to get Paul back to his home planet.

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