1980s cartoon foe of Gargamel

SMURF

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This clue refers to the blue-skinned Smurfs, the tiny forest-dwelling characters from the 1980s cartoon The Smurfs. Gargamel is the bumbling villain who constantly tries (and fails) to capture them, making the Smurfs his main foes. The answer is simply "SMURF" since the group’s name doubles as the singular term for any individual member.