Unlike The Simpsons and Family Guy, South Park has never been very welcoming to celebrity guests. And to be fair, the ever-growing list of famous people that creators Trey Parker and Matt Stone have brutally mocked over the show’s beginning in 1997 likely hasn’t left many willing to collaborate, even in good fun. A select few have shown up as themselves, like Tesla and X CEO Elon Musk and YouTuber PewDiePie, but they’re few and far between—and that’s probably for the better. Even rarer are the stars who dropped in to voice a random character once in the early years of the show without anybody stopping to think, “Am I dreaming, or was that the guy from Law & Order doing Robert De Niro just now?” Without further ado, here are a few voice cameos that may have slipped under your radar…

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