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George Clooney voiced Sparky the Dog in 'South Park' Season 1
TVLine calls Clooney the show's first celebrity guest star and says he recorded only barks and grunts.
TLDR
TVLine reports that George Clooney guest-starred as Sparky the Dog in a Season 1 episode of 'South Park.' It calls him the show's first celebrity guest star and says he recorded only barks and grunts for the role.
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