In the fifth chapter in director Michael Bay's hit sci-fi saga based on the enduring toy line, Autobot leader Optimus Prime is on a crusade to save the Transformers' home planet of Cybertron... by destroying Earth. Armed with an artifact that dates back to the time of King Arthur, can the combined forces of humans and Autobots save the world, turn Prime back to the good side, and defeat a reborn Megatron and his Decepticons? Mark Wahlberg, Josh Duhamel, Laura Haddock, Anthony Hopkins star.