"Inside the computer world of the grid, a young program named Beck becomes the unlikely leader of a revolution against a corrupt regime. His mission is to free his home and liberate his friends from the oppressive reign of the villainous Clu and his evil henchman, General Tesler.
In this quest, Beck is recruited and trained by Tron – the greatest warrior the grid has ever known. Tron not only teaches Beck the fighting skills he will need to challenge this brutal military operation, but he also becomes a mentor and father figure to Beck as he grows beyond his youthful, impulsive nature into a courageous, powerful leader who can inspire an uprising." -- iTunes Store
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Beck inadvertently gets sent to the Games and meets a fierce warrior program Cutler
the fine print: Downloads posted on the Free iTunes Downloads blog are usually free for ~1 week. After that, you'll have to pay for them.