Sentinel was charged with the safety of his secret weapon, the Pillars, which he believed could save their dying planet. He was always patriotic to a fault towards Cybertron, and was a strong willed and determined leader, who held a firm belief in the position of his race in the universe, and demanded respect from all around him, which he earned by proving himself a fierce and powerful warrior. Sentinel Prime was a turncoat Autobot Commander and a double agent. You must see why I had to betray you.( Optimus Prime: You didn’t betray me. Sentinel Prime reveals his true colors and betraying the Autobots and killing Ironhide. with Megatron! *attacks Ironhide* (Ironhide: what have you done?) I hereby discharge you from duty!' For the sake of our planet's survival, a deal had to be made.

'What you must realize, my Autobot brothers, is we were never going to win the war. ~ Sentinel explaining why he must join the Decepticons. For Cybertron! For our home! What war destroyed, we can rebuild - but only if we join with the Decepticons!

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