Many years after the events of Predacons Rising, Cybertron's genesis brings forth a new age of prosperity to a new generation of Transformers. Earth no longer remembers the Decepticon-Autobot conflict as Cybertronians stopped visiting the planet. Bumblebee has since become a seasoned Cybertronian police officer and despite his fame, he chooses to be a humble peacekeeper. Things change when he is summoned by the vision of Optimus Prime. Thought to be long dead after restoring Cybertron, Optimus calls for Bumblebee to return to Earth as a new threat appears.

With the help of Sideswipe (a rebel "bad boy bot") and Strongarm (an Elite Guard cadet partnered to him), the trio makes it to Earth to discover a crashed maximum security prison ship called the Alchemor and its steward Fixit (a hyperactive Mini-Con with faulty wiring). They soon learn the ship had over a hundred Decepticon prisoners within Stasis Pods, but all of its inmates have escaped. It is now their duty to recapture all the escaped Decepticon prisoners before they cause further harm on Earth. With the aid of humans Russell and Denny Clay and the Dinobot Grimlock (who was a prisoner of Alchemor before siding with Bumblebee). Bumblebee leads this unlikely team to protect Earth from the Decepticon prisoners led by Steeljaw and restore order.

[Source: Wikipedia]