Megatron raises his sword, while all Optimus can do is shield ... Optimus would have fallen to Megatron in this fight. In Transformers: Prime, Megatron aims to restore his master, Unicron, to ...

Before they became bitter enemies, Optimus Prime and Megatron were once friends. What went wrong? The fractured relationship is teased in Paramount’s new trailer for Transformers One.

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.