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Leave it to the good people at MTV to take the cutthroat world of Survivor and transform it into a wild, boozy free-for-all. After an incredible 23 seasons, The Challenge is still going strong — and so are its rotating stable of attractive, athletic, party-ready contestants. In preparation for Rivals II's summer run, let's take a look at the combustible teams forced to work together for the $350,000 prize.