Discover the events that sparked the epic rivalry between the most iconic characters in the Transformers universe. Transformers One tells the untold origin story of Orion Pax and D-16, better known as sworn enemies Optimus Prime and Megatron, but were once bonded like brothers who changed the fate of Cybertron forever. The first-ever fully CG-animated Transformers film features a star-studded voice cast, including Chris Hemsworth as Orion Pax, Brian Tyree Henry as D-16, Scarlett Johansson as Elita-1, and Keegan-Michael Key as B-127, with Steve Buscemi, Laurence Fishburne, and Jon Hamm completing the cast.