On Cybertron the Autobot resistance, led by Optimus Prime, is on the verge of losing the civil war against the Decepticons and prepare to evacuate the planet. A Decepticon force, led by Soundwave and Shockwave, intercepts them during the evacuation, and Optimus sends Autobot scout Bumblebee to Earth on an escape pod in order to set up a base of operations where the Autobots can regroup.