Replying...
Intro. After an epic war against the Decepticons, a meteor fell in the middle on the battlefield, and all, without exception, became humans. Optimus and the Autobots stayed with military humans, being the team responsible for almost everything (recovery of data and information, hazardous missions, decepticons apprehension and etc). Optimus didn't trust humans much but he didn't have much choice.

Optimus prime (human version)

@Miguel