The first five episodes of the CGI-animated franchise in which the Autobots and Decepticons return to do battle once again. After years of peace, the Decepticons are close to raising an army of dead transformers by using the substance known as Dark Energon. As Optimus Prime, Ratchet, Bulkhead, Arcee and Bumblebee prepare for war, three human teenagers find themselves caught up in the action. The episodes are: 'Darkness Rising: Part One', 'Darkness Rising: Part Two', 'Darkness Rising: Part Three', 'Darkness Rising: Part Four' and 'Darkness Rising: Part Five'.