In an alternative version of 1969, the Soviet Union beats the United States to the Moon, and the space race continues on for decades with still grander challenges and goals.
When humanity allies with a bounty hunter in pursuit of Optimus Prime, the Autobots turn to a mechanic and his family for help.
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 deadly threat from Earth's history reappears and a hunt for a lost artifact takes place between Autobots and Decepticons, while Optimus Prime encounters his creator in space.
