Sam Witwicky leaves the Autobots behind for a normal life. But when his mind is filled with cryptic symbols, the Decepticons target him and he is dragged back into the Transformers war.

An ancient struggle re-erupts on Earth between two extraterrestrial clans, the heroic Autobots and the evil Decepticons, with a clue to the ultimate power held by a young teenager.

Sam Witwicky leaves the Autobots behind for a normal life. But when his mind is filled with cryptic symbols, the Decepticons target him and he is dragged back into the Transformers war.

A youth chooses manhood. The week Sam Witwicky starts college, the Decepticons make trouble in Shanghai. A presidential envoy believes it s because the Autobots are around; he wants them gone. He s wrong: the Decepticons need access to Sam s mind to see some glyphs imprinted there that will lead them to a fragile object that, when inserted in an alien machine hidden in Egypt for centuries, will give them the power to blow out the sun. Sam, his girlfriend Mikaela, and Sam s parents are in danger. Optimus Prime and Bumblebee are Sam s principal protectors. If one of them goes down, what becomes of Sam?

Autobots Bummblebee, Rachet, Ironhide and Sideswipe led by Optimus Prime, are back in action taking on the evil Decepticons, who are eager to avenge their recent defeat. The Autobots and Decepticons become involved in a perilous space race between the U.S. and Russia, to reach a hidden Cybertronian spacecraft on the moon and learn its secrets, and once again Sam Witwicky has to come to the aid of his robot friends. New villain, Shockwave, who rules Cybertron, is on the scene while the Autobots and Decepticons continue to battle it out on Earth.

The Autobots learn of a Cybertronian spacecraft hidden on the Moon, and race against the Decepticons to reach it and to learn its secrets.