PrologueTRON, a hero programed by Allen to protect the grid. Flynn based his system out of the ENCOM system. But he built a better version of that system and called it, "The TRON system". It's creator, Flynn designed it for games, but it grew into something much more. He was able to enter and exit through a laser that could materialize in digital realm, the grid.
He built a digital copy of himself, named CLU. His purpose was to help create the perfect system. However, CLU hungered for power, and betrayed Flynn. TRON fought while Flynn escaped. He never saw TRON again. TRON, had been derezed.