Well, that's more sensical than having no explanation at all! At least it came from somewhere! I never played Tron. What was the "MPC Cone"?
It's MCP, Master Control Program. The "plot" (such as it were) of Tron was a super invassive computer program that was trying to take over the world of computers. A programmer gets sucked into the world and teams up with the super security program a friend of his wrote (Tron) to defeat the MCP, in the virtual world the MCP was a big cone of rainbow light with a face on it (just like in the South Park episode only slightly better animated). In the end Tron was really all about animation, they used every technique of the time except stop motion/ clamation, including two different types of what we'd now call CGI and it was the first movie since Marry Poppins to have live action people interact with animated stuff (and the interacted a lot more tightly than the penguin dance in Marry Poppins). Starring Bruce Boxleitner as Tron in one of his only two major scifi roles, good time, solid family entertainment, and an amazing if unfortunately dated technical achievement.
I'm a big Tron dweeb, in case you couldn't guess.