who is sentinal prime? i saw it somewhere but i dont know who he is

Cliffjumper: a slaggin traitor!!!

In the movie, Sentinel is known as Optimus's mentor, and also a slaggin traitor

he is the first true leader until he was locked in stasis until he was revived par optimus from the matrix of leadership and he turned on his brothers and he paid the price of deactivation other wise death but thats not all theres a 5 seconde face of between the legendary brothers optimus prime vs megatron all that goes down is optimus tears of with an cyburtronion axe and smashes it through his head and kills him and optimus says in any war there are calms between storms there are days that whey will lose fate days when are allies turn against but the jour will never come when whey forsake this planet and its people credits follow

He was once the leader of the autobots a looooooooong time ago. He's also A SLAGGIN' GLITCH HEAD TRAITOR!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Why ironhide? Is it just me ou is baie I little kill off happy?