Plot: After the battle between the Autobots and Decepticons that leveled Chicago, humanity thinks that all alien robots are a threat. So Harold Attinger, a CIA agent, establishes a unit whose sole purpose is to hunt down all of them. But it turns out that they are aided by another alien robot who is searching for Optimus Prime. Cade Yeager, a "robotics expert", buys an old truck and upon examining it, he thinks it's a Transformer. When he powers it up, he discovers it's Optimus Prime. Later, men from the unit show up looking for Optimus. He helps Yeager and his daughter Tessa escape but are pursued by the hunter. They escape and Yeager learns from technology he took from the men that a technology magnate and defense contractor named Joshua Joyce is part of what's going on, so they go to find out what's going on.
Alternative Plot: 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 up to meet their most fearsome challenge yet: a worldwide war of good versus evil.
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