Sam Witwicky is a teenager who ends up in the middle of a war. The war is between the heroic Autobots and the villainous Decepticons. They are two factions of alien robots who can disguise themselves by transforming into everyday machinery, primarily vehicles. The Autobots intend to use the AllSpark, the object that created their robotic race, to rebuild their home planet Cybertron and end the war. However the Decepticons have the intention of using it to build an army by giving life to the machines of Earth.