A runaway train's fusion engine is up for grabs and the Stunticons are in pursuit, so the Bee Team must do all it can to prevent them from getting the cargo. An additional threat arises as the train could potentially crash into Crown City Train Station.
Bumblebee is summoned to save Earth from a new faction of Decepticons and assembles a rogue team of young Autobots that includes a rebel bad boy bot, an elite guard cadet, a bombastic Dinobot and hyperactive Mini-Con to capture their new enemies.
Each new bot is a fully capable action hero but inexperienced in working together in a team, forcing Bumblebee to become both squad leader and coach