The Simpsons airs its landmark 600th episode and 27th "Treehouse of Horror" installment on Sunday (Fox, 8 ET/PT). Now, while we love Homer, Marge, Bart, Lisa and Maggie, the reason we keep returning to Springfield nearly three decades later has as much to do with the town's other residents as it does the residents of 742 Evergreen Terrace. Two of USA TODAY's biggest Simpsons fans make their cases for the series' most valuable supporting character.
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Source: USA Today