From a killer astronaut to a very bad girlfriend to one really, really, really fat criminal mastermind, Monk's adversaries have come in all shapes and sizes. All have been memorable in their own ways, but certain killers have had a little something special, a certain lethal je ne sais quoi that has made them particularly challenging opponents. Think you know all there is to know about Monk's toughest adversaries and nastiest nemeses? Take the quiz and find out.

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