'Transformers One' trailer shows past brotherhood of Optimus Prime and Megatron

Before they were sworn enemies, Optimus Prime and Megatron were as close as brothers.

"Transformers One," an upcoming animated origin film, is set to show us that brotherhood that ultimately changed Cybertron forever.

The newly released trailer gives a glimpse of their antics and shenanigans, as well as how they learned to transform for the first time.

Chris Hemsworth and Brian Tyree Henry will voice young Optimus Prime and young Megatron.

The voice cast also includes Scarlett Johansson, Keegan-Michael Key, Steve Buscemi, with Laurence Fishburne, and Jon Hamm.

"Transformers One" rolls out into Philippine cinemas on September 18. —JCB, GMA Integrated News