From Shakefire: "The original 1982 Tron was one of the first movies that used computer imagery to create three-dimensional environments. Since then, it has become somewhat of a cult hit, building itself into a franchise consisting of video games, theme park attractions, and light cycles.
Tron: Legacy takes place 20 years after the original. Legendary programmer and CEO of ENCOM Kevin Flynn (Jeff Bridges) mysteriously disappeared years ago, leaving his young son Sam (Garrett Hedlund) alone left wondering where his father went. One night, Sam is told by Flynn’s lifelong friend about a page he received from the old arcade. While investigating, Sam is suddenly digitized and sent to The Grid, the world his father created and home of the programs. There he reunited with his father although that celebration is short lived as they must evade capture from Clu 2, the security program made by Flynn who has taken over command and will stop at nothing to escape into the real world."