Sentinel Prime

Sentiel Prime is a Autobot Leader.

First Life
Sentinel Supreme was a elite Omega Sentimel. he was a Autobot who worked for Nemesis Prime. When The battle of the Primes happened, Zeta Prime re-passed the Matrix to him, making him Sentinel Prime. He defeated Nemesis Prime.

Autobots
When Megatron made the Decepticons, He made the Autobots. He died in a fight with Megatron, and he passed the Matrix to Optronix..

Return
Primus revived him to fight The Fallen and make Scround Zeta Prime. When his mission was complete, he was returned to the Matrix.