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“The Cognition Regeneration” — Pictured: Penny (Kaley Cuoco), Bernadette (Melissa Rauch) and Amy Farrah Fowler (Mayim Bialik). Leonard isn’t thrilled when Penny considers taking a new job offered by her ex-boyfriend, Zack (Brian Thomas Smith), on THE BIG BANG THEORY, Thursday, April 27 (8:00-8:31 PM, ET/PT), on the CBS Television Network. Photo: Michael Yarish/Warner Bros. Entertainment Inc. © 2017 WBEI. All rights reserved.