Impostor

Set in 2079, Earth has been at war with an alien force for over a decade. A praised government scientist, Spencer Olham (Sinise), whose latest work promises to save the planet, is suddenly accused of being an alien spy, and becomes the subject of a nationwide manhunt. Olham must now prove his identity to the secret police in time to help save mankind.

Based on the 1952 short story by Philip K. Dick.