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S15 E10: The Milkshake Murders (a.k.a. A Tale of Two Brothers)
Celebrity guests are split into two teams to compete in various contests. One guest, known only to himself, is designated the "X-Man", and does his best to cause his team to lose the contests. At the end, all guests try to determine the X-Man's identity.
Season 15
Episode 10 of 98











