After an epic battle, a great city lies in ruins, but the Earth itself is saved. As humanity begins to pick up the pieces, a shadowy group emerges to try to take control of history. Meanwhile, an ancient and powerful new menace sets its sights on Earth. A new group of humans, led by Cade Yeager (Mark Wahlberg), helps Optimus Prime (Peter Cullen) and the Autobots rise to meet their most fearsome challenge yet: a worldwide war of good vs. evil.