Decades before the Cybertronian wars reach earth, a ship from the robot planet crash lands on earth’s moon. That event prompts President Kennedy to kick America’s space program into high gear. During the first lunar landing, the astronauts carry out a top secret mission to investigate the strange craft. 42 years later, The Autobots and Decepticons have brought their destructive civil war to earth. A defeated Megatron (Hugo Weaving) plans to obtain the precious cargo of the downed craft and use it in a scheme that will return him to power and revive his beloved Cybertron. Optimus Prime (Peter Cullen) and Sam Witwicky (Shia Lebeouf) must engage the Decepticons in a final battle that holds the survival of humanity itself in the balance.