After more than nine years together, the gang finally celebrates Sheldon’s birthday, surprising him with a special guest, on the 200th episode of THE BIG BANG THEORY, Thursday, Feb. 25 (8:00-8:31 PM, ET/PT) on the CBS Television Network. Seated left to right: Kunal Nayyar, Kaley Cuoco, Adam West, Simon Helberg and Johnny Galecki Standing left to right: Mayim Bialik, Sara Gilbert, Kevin Sussman, Jim Parsons, Melissa Rauch, Wil Wheaton, Christine Baranski and John Ross Bowie






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