Some say he's Ben Collins, that he eats engine grease out of pudding containers - if he eats at all, with a heaping side of engine coolant. Some say he's solar powered (maybe that was from the show), or nuclear-powered. Some say he invented nuclear fusion, the art of drifting, and the concept of a heliocentric universe, but he lets Galileo take credit for that, in exchange for getting NASA to name the Jupiter spaceprobe after him. All we know is, he's called The Stig.