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Season 4, "Thanksgiving"
They did Gaga. They did Britney. But did they have to do Psy? We're used to having to suspend our disbelief for Glee, but making viewers think that the glee club, led by Finn, we might add, would actually try to win Sectionals with a Korean pop song performed to a wildly inappropriate dance was just too out there. If this isn't a cry for Mr. Schue's help, we don't know what is.