Comedy legend Mark McKinney made a triumphant return appearance to the show to talk about the season 3 finale of "Superstore." We discussed the development of his character "Glenn," including the nuances of the St. Louis accent and how it was based on my St. Louis-raised-wife's next-door neighbor. Mark and I also made plans to attend a White Sox game this summer and share some mac and cheese, ketchup, and tapeworm food.