Tron: Legacy is a 2010 American science fiction action film directed by Joseph Kosinski from a screenplay by Adam Horowitz and Edward Kitsis, based on a story by Horowitz, Kitsis, Brian Klugman, and Lee Sternthal. It serves as a sequel to Tron , whose director Steven Lisberger returned to co-produce. The cast includes Jeff Bridges and Bruce Boxleitner reprising their roles as Kevin Flynn and Alan Bradley, respectively, as well as Garrett Hedlund, Olivia Wilde, James Frain, Beau Garrett, and Michael Sheen. The story follows Flynn's adult son Sam, who responds to a message from his long-lost father and is transported into a virtual reality called "the Grid", where Sam, his father, and the algorithm Quorra must stop the malevolent program Clu from invading the real world.