Stream NowAdd like... Transformers OneTransformers OneWatch transformers one 123movies. The untold origin story of Optimus Prime and Megatron, better known as sworn enemies, but once were friends bonded like brothers who changed the fate of Cybertron forever. Genre: Animation, Science Fiction, Adventure, FamilyDirector: Josh CooleyCast: Chris Hemsworth, Brian Tyree Henry, Scarlett Johansson, Keegan-Michael Key, Jon Hamm, Steve Buscemi, Laurence Fishburne, Vanessa Liguori, Jon Bailey, Jason Konopisos-Alvarez, Evan Michael Lee, James Remar