Ed Dillinger Sr. is the Bigger Bad/tertiary antagonist in the 1982 film Tron.
He was portrayed by David Warner, who also played the Master Control Program and Sark. He also played John Leslie Stevenson a.k.a. Jack the Ripper in the 1979 film Time After Time, The Evil Genius a.k.a. Evil in the 1981 film Time Bandits, Geoffrey Tolwyn in the 1999 film Wing Commander.
Ed Dillinger, Sr. is the president of ENCOM at the outset of the story. He only cares about his position and is determined to keep it. He also created the Master Control Program in order to ensure that he maintains control of ENCOM. His ultimate goal is to use the programming abilities of Space Paranoids (which was created by his former employee Kevin Flynn) to get rich. However, he starts to have second thoughts when the MCP plans to control all of the world's systems and even blackmailed him into helping otherwise his thefts would be exposed. After the MCP was de-rezzed by Kevin, the thefts were exposed and Dillinger presumably goes to jail.
- He had a son named Edward Dillinger, Jr., who is currently working at ENCOM in Tron Legacy.