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簡介2： Five years after the Decepticons' invasion of Chicago, and humanity has grown fearful of Transformers. Although Autobots are officially granted sanctuary, they are secretly hunted down by Cemetery Wind, an elite CIA black operation unit, with the help of a transformer bounty hunter named Lockdown. They ambush and brutally kill most of the Autobots, while their primary target, Optimus Prime, is still hiding somewhere after sustaining serious injuries after an ambush.
Cade Yeager, a struggling inventor and a "robotics expert", buys an old truck in an attempt to salvage some money. Upon examining it, he discovers that the truck is the injured Optimus Prime and repairs him after unexpectedly bringing him back to life.
After locating Optimus, Cemetery Wind and Lockdown travel to Texas to confront Cade. Optimus comes out of hiding and helps Cade and his friends to escape. Cade hacks into a drone that he took from the attack, and he finds the footage of the ambush and the death of Ratchet and Leadfoot, who are also Optimus Prime's companions. He then learns that Cemetery Wind is working with a robotic corporation called Kinetic Solutions Incorporated (KSI). They, together with Optimus Prime's companion Autobots, decide to infiltrate KSI headquarters in Chicago for information.
It turns out that KSI captured and imprisoned Brains, a transformer who survived the Battle of Chicago. They use Brains to decode dead Transformers and utilize the data for human-created Transformers. Using data gathered from the remains of Megatron, they create Galvatron as their next-generation Transformer. It turns out Galvatron is the reincarnated Megatron, who has been manipulating KSI to build more Decepticons to wipe out humanity. He activates by himself and infects all KSI transformer prototypes to start wiping out humanity. After a series of fights, Galvatron, who is the only survivor, retreats. He vows to return another day.
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