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Fallout Boy is a recurring character from TV series The Simpsons. He is voiced by Dan Castellaneta and Pamela Hayden.
He appeared for the first time in the episode "Three Men and a Comic Book". He is the sidekick in the comic book series Radioactive Man. In the series, Fallout Boy first appeared in a 1950s Radioactive Man film serial shown at a comic book convention in the episode "Three Men and a Comic Book", and it was implied that the actor who played Fallout Boy might have been gay. However, unlike many Simpsons characters, he has only made a handful of appearances since. He also appeared in "The Simpsons: Tapped Out".