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"The Conjugal Conjecture" -- Pictured: Alfred (Judd Hirsch) and Beverly (Christine Baranski). After Sheldon's mother and Leonard's father share an evening together, everyone deals with an awkward morning the next day. Also, Penny's family arrives for the wedding ceremony, including her anxiety-ridden mother, Susan (Katey Sagal), and her drug dealing brother, Randall (Jack McBrayer), on the 10th season premiere of THE BIG BANG THEORY, Monday, Sept. 19 (8:00-8:30 PM, ET/PT), on the CBS Television Network. Dean Norris guest stars as Colonel Williams, an Air Force Representative from the Department of Materiel Command. Christine Baranski, Laurie Metcalf, Judd Hirsch and Keith Carradine return. Photo: Monty Brinton/Warner Bros. Entertainment Inc. © 2016 WBEI. All rights reserved.