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The Celebration Experimentation

After more than nine years together, the gang finally celebrates Sheldon’s birthday, surprising him with a special guest.
Aired: Feb 25, 2016 Genre: ComedyCasts: Johnny Galecki Jim Parsons Kaley Cuoco Simon Helberg Kunal Nayyar Melissa Rauch Mayim BialikCreated By: Chuck Lorre Bill PradyProducers: Mark Cendrowski David Goetsch Eric Kaplan Jim Reynolds Steve Holland Maria FerrariDuration: 22m Rating: 3.6 Country: United States of America Production: Chuck Lorre Productions, Warner Bros. Television