Jimmy Doyle is a classmate of Charlie's from high school. He is Tommy's real father, whom he had with Stacy Corvelli. He left them when Tommy was around 10, but not before imparting him with the annoying habit of constantly saking "Why?" to everything someone says. ("Charlie Wants an Abortion"). He shows up again during their high school reunion, bullying Charlie, Mac, and Frank. ("The High School Reunion")

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