Synopsis by Mark Deming
Aspiring truant Bart Simpson (voice of Nancy Cartwright) hopes to get out of school by presenting his teacher with a phony note, purportedly written by his mother and excusing him for a dental appointment. However, Bart's frequent nemesis Principal Skinner (voice of Harry Shearer) smells a rat, and devotes his day to tracking down Bart. As Skinner gives chase, Bart slips away and sneaks into what turns out to be the Quimby Family compound, where Springfield political kingpin Mayor Joe Quimby (voice of Dan Castellaneta) is holding a lavish birthday party for his nephew Freddy (also voiced by Castellaneta). Arrogant Freddy begins taunting a waiter, and later the waiter turns up seriously injured; everyone naturally assumes that Freddy roughed up the server, and he's soon on trial for assault. However, Bart was the only witness to the event, and as the trial goes on, he's torn between the dictates of his conscience and his fear that he'll be in for big punishment from his parents as well as Skinner if he admits to the court he was playing hooky. "The Boy Who Knew Too Much" first aired on May 5, 1994.