Marking the 100th episode milestone of "The Middle," the citizens of Orson, Indiana celebrate the Orsontennial - the town's 100th anniversary. During this momentous event, Frankie and Mike find themselves begrudgingly trying to drive a giant cow float in the parade; Axl, Sean and Darrin resurrect Boss Co. and attempt to make some big bucks by setting up a VIP area to view the festivities; Sue, still crushing on Darrin, tries to make him jealous by pretending to be dating Brad again; and Brick tries to earn himself a place in Orson history by entering a contest to come up with the town's new motto, which will be used for the next 100 years

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Guest Stars: Brian Doyle-Murray as Mr. Ehlert, Jen Ray as Nancy Donahue, Beau Wirick as Sean Donahue, John Gammon as Darrin, Brock Ciarlelli as Brad Bottig, Pat Finn as Bill Norwood, Christiann Castellanos as Angel, Charles C. Stevenson as Old Hoosier, Lyn Mahler as Kristen Rice, Ari Welkom as Ron Cougar Mellencamp

Viewers: 8.31 million Households Rating: 5.7/9 Adults 18-49 Rating: 2.2/7