Jetfire is a brilliant scientist, known for his speed and technological prowess. He has a strong moral compass, which led to his falling out with his former friend Starscream, and does not believe in grey areas when making major decisions. He left Cybertron on a research mission before the Autobot/Decepticon war broke out, and when he wound up on Earth, he was fatally wounded by Starscream, only to be brought back by Ratchet, stuck in his new alt mode.