Impostor is a 2001 American science fiction film based upon the 1953 short story of the same name by Philip K. Dick. The film starred Gary Sinise, Madeleine Stowe, Vincent D'Onofrio and Mekhi Phifer. The movie takes place in the year 2079. 45 years earlier, Earth was attacked by a hostile and implacable alien civilization from Alpha Centauri. Force shield domes are put in place to protect cities, and a totalitarian global military government is established to effect the war and the survival of humans. The film follows Spencer Olham, a designer of top secret government weapons.