Impostor

Impostor (2001) is an American sci-fi thriller you can watch online on iFILM, directed by Gary Fleder and based on a Philip K. Dick short story. Gary Sinise plays Spencer Olham, a government weapons scientist fighting on humanity's side in a decade-long war against an alien species.

One morning, a shadowy security agency arrests Spencer on a single charge: they believe he is not human at all — a biological duplicate planted by the enemy, built to kill a high-value target. With Madeleine Stowe, Vincent D'Onofrio, and Tony Shalhoub in supporting roles, the film turns a chase thriller into something more unsettling. Spencer has to prove his own humanity while hunted by everyone who once trusted him. And the question the story keeps pressing on — does he even know the truth himself?

Stream Impostor (2001) in good quality on iFILM — Philip K. Dick's paranoid vision of identity and war, translated to the screen with a cast that keeps the tension grounded.