Transformers One took the opportunity to not only reveal how Optimus Prime and Megatron became the respective leaders of the Autobots and the Decepticons, but the prequel film also revealed how Orion Pax and D-16 went from simple mining 'bots to full-fledges Transformers.

Cybertron is now being led by Optimus Prime, which upsets Megatron. Optimus Prime orders Megatron to leave and never return, exiling him. Megatron promises that it is not over as he and his Decepticons leave the planet.

Transformers One is an animated prequel that explores the origins of the Transformers, an alien race of metallic humanoids that can transform into vehicles. It delves into the roots of the conflict between the franchise's rival groups: the Autobots and the Decepticons.