Sentinel Prime

Sentinel Prime is a main antagonist, who made his only appearance in Transformers: Dark of the Moon. He is voiced by Leonard Nimoy.

Sentinel was Optimus Prime's direct predecessor, mentor and father figure. He was originally an Autobot, a leader before Optimus. He betrayed the Autobots and became a Decepticon so that he could save Cybertron, their home planet. However, he was killed by Optimus.

Appearances

 * Transformers: Dark of the Moon