For centuries, two races of robotic aliens - the Autobots and the Decepticons - have waged a war, with the fate of the universe at stake. When the battle comes to Earth, all that stands between the evil Decepticons and ultimate power is a clue held by young Sam Witwicky (Shia LeBeouf). An average teenager, Sam is consumed with everyday worries about schools, friends, cars and girls. Unaware that he alone is mankind's last chance for survival, Sam and his friend Mikaela (Megan Fox) find themselves in a tug of war between the Autobots and the Decepticons. With the world hanging in the balance, Sam comes to realize the true meaning behind the Witwicky family motto - 'No sacrifice, no victory!'