In the original Marvel Comics continuity, Optimus Prime was, as in other timelines, the only Autobot to bear the Matrix of Leadership. Before Optimus, there was an Autobot named Sentinel Prime ...

Still following its prime directive to protect Juston ... problem for Earth's Mightiest Heroes. The Sentinels of the currently ongoing Marvel Comics series were imbued with cybernetic augmentation ...

(Image Source: Marvel / Andrei Bressan ... that the new breed of Sentinels have the same flaws as their predecessors. Uncanny X-Men #9 is now available at comic shops everywhere.