Bumblebee, Sideswipe and Strongarm are guided to Earth by a vision of Optimus Prime - and discover a band of Decepticon fugitives and two human friends.
While Bumblebee works to get Grimlock to trust them, they must work together when the Sharkticon Hammerstrike has been targeting oil tankers. Meanwhile, the others have their encounter with Steeljaw.
As Optimus returns to Earth to face the mysterious "evil" prophesied, the Bee Team must prevent Steeljaw's pack from teleporting that same threat to Earth.