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Sentinel Prime is the “ancestor” of Transformers “good guy” autobot Optimus Prime. In Dark of the Moon the wreckage of Sentinel Prime is found on the moon by the Apollo 11 Astronauts and brought to Earth where he adopts the vehicle disguise of a Rosenbauer fire truck. Nimoy, who is most famous for his role as Mr. Spock in Star Trek, is no stranger to the Transformers universe. In 1986 he provided the voice of Galvatron in Transformers: the Movie.