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The Angry Beavers 20th Anniversary Marathon was a 4-hour The Angry Beavers marathon that aired on UltraToons Network on Wednesday, April 19, 2017 from 10:00 PM to 2:00 AM. The marathon served as a 20th birthday celebration for the Nickelodeon series The Angry Beavers, and featured some of the greatest episodes starring Norbert and Daggett.