Graeme Willy ( Pegg) and Clive Gollings (Frost) accidentally went into the center of American UFO. Here, they met an alien named Paul. In the past 60 years, Paul has held a important military secret. For some reasons, Paul has decided to escape from the American UFO. Paul rented the RV of Graeme Willy and Clive Gollings. Being chased federal agents, Graeme and Clive must set up a plan to return Paul to his mother spaceship.