Set on Cybertron, “Transformers One” is the origin story of how Optimus Prime (voiced by Chris Hemsworth) and Megatron (Brian Tyree Henry) go from the closest friends to sworn enemies.

a.k.a. Optimus Prime (Chris Hemsworth), and D-16, a.k.a. Megatron (Brian Tyree Henry), and their complicated history on planet Cybertron three billion years prior to the core "Transformers" narrative.

That’s where the characters find themselves in “Transformers One,” the animated origin story of Optimus Prime and Megatron. Up to this point in the movie, the film’s leads have not been in ...