In the tragic Chicago War, although the Autobots successfully repelled the invasion of the Decepticons, they also made the people of Earth lose their due trust and respect for them. The "Gravewind" force formed by the CIA hunted all Transformers indiscriminately, and for a time, all the Autobots and Decepticons disappeared from the earth. One day, Cade Eager (MarkyMark), a down-and-out mechanical inventor living in Texas, bought a dilapidated truck head, who knew that it was the dormant Autobot leader Optimus Prime. The Gravewind troops smelled the breath and swarmed in. After waking up, Optimus Prime rescued Cade's family and contacted the Autobots scattered in every corner. On the other hand, crazy human scientists learned the secret of their transformation from the wreckage of the Transformers, and tried to use it to create artificial King Kong, and Galvatron, who was born from Megatron, was their proud work and the god of death. A new round of crisis is coming, and the earth is facing a greater disaster...