 Kevin Flynn is a former employee of the software corporation ENCOM, now running a arcade. Flynn has been trying to hack into ENCOM s mainframe computer to find evidence that ENCOM s senior executive Ed Dillinger stole four video games he created. But Dillinger s supercomputer "Master Control Program" foils Flynn s efforts and dictates and controls most of the computer systems. One night, Flynn s former girlfriend Lora and her boyfriend, ace computer programmer Alan Bradley helps Flynn break into ENCOM to shut down the MCP with Alan s security program "TRON". But MCP uses Lora s matter transmission program and converts Flynn into data and sends him into the computer. Flynn finds himself in a electronic world ruled by the MCP and his evil chief henchman Sark, where computer programs are the alter-egos of their creators and are forced to compete in gladiatorial games. With help from Tron, a heroic and fearless security program and his lover, Yori, Flynn sets out destroy the MCP and help Tron liberate the system from the MCP s control, by destroying the MCP is Flynn s only way of returning to the real world.