In the third part of Transformers: Dark of the Moon (the trailer), Optimus Prime will lead the "Autobots" to continue fighting against the "Decepticons" who have returned after their defeat in the second movie. The "Autobots" and "Decepticons" are caught up in the dangerous "space race" between the United States and the Soviet Union, and once again, the human Sam will offer his helping hand to his robot friends. This installment will introduce new Transformers, including the major villain "Shockwave."