Déjà Vu is a science fiction action thriller directed by Tony Scott and starring Denzel Washington as ATF agent Doug Carlin. After a catastrophic ferry bombing in New Orleans, Carlin joins a top-secret government unit using experimental "Snow White" technology that allows them to look exactly 4 days and 6 hours into the past. While initially intended as a surveillance tool, Carlin realizes the tech can be used to alter history and prevent the tragedy.