For the past 60, years an alien named Paul (voiced by Seth Rogen) has been hanging out at a top-secret military base for reasons unknown. The space-traveling smart ass decides to escape the compound and hop on to the first vehicle out of town - a rented rv containing earthlings Graeme Willy (Pegg) and Clive Collings (Frost).
Chased by federal agents and the fanatical father of a young woman that they accidentally kidnap, Graeme and Clive hatch a fumbling escape plan to return Paul to his mother ship. And as the two nerds struggle to help, one little green man might just take his fellow outcasts from misfits to intergalactic heroes.
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