Agent H and Agent M are on a mission to protect the earth from the deadly aliens and must also tackle the biggest threat present within their own ranks.

On the run from the Decepticons, Optimus Prime sends Autobot scout B-127 to Earth on an escape pod in order to set up a base of operations where the Autobots can regroup. Landing in the year 1987, B-127 finds refuge in a junkyard in a small Californian beach town. Meanwhile a girl named Charlie, on the cusp of turning 18 and trying to find her place in the world, discovers B-127 in the form of a Volkswagen Beetle, battle-scarred and broken. While Charlie attempts to fix the Beetle, it transforms into B-127, whom she befriends and nicknames "Bumblebee". She then unknowingly unlocks a message from Optimus urging Bumblebee to defend planet Earth.