Sentinal Prime was the former leader of the Autobots before Optimus Prime. He was in stasis mode in The Arc since it crash landed on Earth's moon. After learning of the connections to it, Optimus went with Ratchet and desperately brings Sentinal home to earth and brings him back with the Matrix. Sentinal saw where he was when Optimus and the autobots mentioned where they were and then Sentinal tells the director about the Pillars that they defy the laws of physics by transportin anything at any size to a certain part of the universe. Later after maintaining a vehicle mode Sentinal explores the planet with Optimus and finds it peaceful unlike the last day of Cybertron. Optimus offers to lend Sentinal back his possision as leader along with the Matrix but Sentinal denys it and tells him to keep them both.