Transformers One tells the untold origin story of how Optimus Prime and Megatron went from BFFs to sworn enemies, and since it's set in the past, there have been some changes to who's playing them.

The star-studded voice cast of ... of the Transformers and the relationship of two workers, Orion Pax and D-16, who segue from brothers-in-arms to sworn enemies as Optimus Prime and Megatron ...