Since time immemorial, a merciless war has been waged between two races of alien robots: the Autobots and the cruel Decepticons. At stake: the mastery of the universe. In the early years of the 21st century, the conflict spreads to Earth, and young Sam Witwicky unwittingly becomes humanity's last hope. Like thousands of teenagers, Sam has known only the worries of his age: high school, friends, cars, girls.