Teenager Sam Witwicky only wants to impress a girl when he buys his first car, never suspecting that the clunker is actually an alien being able to transform into a machine. Sam is dragged into an age-old war between two factions of extraterrestrial robots: the noble Autobots, led by Optimus Prime, and the sinister Decepticons, bent on seizing an artifact of unlimited power that Earth conceals. With the U.S. military and the forces of both sides converging, the fate of the planet comes to rest on a kid and his car. An outsized spectacle of action and digital effects directed by Michael Bay.