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"The Comet Polarization" - Pictured: Howard Wolowitz (Simon Helberg), Leonard Hofstadter (Johnny Galecki), Rajesh Koothrappali (Kunal Nayyar), Penny (Kaley Cuoco), Sheldon Cooper (Jim Parsons) and Amy Farrah Fowler (Mayim Bialik). Sheldon's comic book store experience changes when writer Neil Gaiman puts Stuart's store on the map. Also, Koothrappali takes credit for Penny's astronomical discovery and friendships are threatened, on THE BIG BANG THEORY, Thursday, April 19 (8:00-8:31 PM, ET/PT), on the CBS Television Network. Photo: Jordin Althaus/Warner Bros. Entertainment Inc. © 2018 WBEI. All rights reserved.
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