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Mysterion is a character that appeared in the Season 13 episode: "The Coon", and made a comeback in the episode "Coon 2: Hindsight", as well as "Mysterion Rises" and another appearance in "Coon Vs. Coon and Friends."
Who this masked crime-fighter is just might be the greatest question in South Park history, next to maybe who Cartman's father is. And, in "Mysterion Rises", it was finally revealed: