Edward Dillinger, Sr.

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Edward "Ed" Dillinger, Sr. is one of the main villains in TRON, and wrote both Sark and the Master Control Program. He was a programmer when he started his job at ENCOM, but soon climbed the ranks until he reached Senior Executive, thanks to the abilities of MCP. Little did everyone at ENCOM know that Dillinger wrote the MCP to appropriate any program that was considered useful. One of these programs was the game "Space Paranoids" which was actually created by former employee Kevin Flynn. After the termination of the MCP by Tron and Flynn, Dillinger was presumably exposed as a fraud and was sent to prison, which coincides with the scenario the MCP presented to Dillinger in the film.

Skills
While regarded as "not too bright" by Flynn, Dillinger demonstrated more than enough programming skill to convert the MCP into the corporate raiding tool that facilitated his rise to power. He clearly possessed enough skill and business acumen to raise ENCOM from its humble beginnings in a garage to the corporate giant it was at the beginning of the movie.

Trivia

 * In TRON Legacy, Dillinger's son Edward Dillinger, Jr. is an employee at ENCOM who designed ENCOM OS-12, formerly known as Flynn OS, which was stolen by Sam Flynn. Irish Actor Cillian Murphy played the character in an uncredited cameo role.