The Big Bang Theory
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The Celebration Experimentation
Season 9 - Episode 17

After more than nine years together, the gang finally celebrates Sheldon's birthday, surprising him with a special guest.

Production Number:
Aired On: Thursday 25th of February 2016 on CBS ( US )
Written by: TBA
Directed by: TBA
Starring: Johnny Galecki as Leonard Hofstadter
Jim Parsons as Sheldon Cooper
Kaley Cuoco as Penny Hofstadter
Simon Helberg as Howard Wolowitz
Kunal Nayyar as Raj Koothrappali
Mayim Bialik as Amy Farrah Fowler
Melissa Rauch as Bernadette Rostenkowski
Kevin Sussman as Stuart Bloom
Christine Baranski as Dr. Beverly Hofstadter
Sara Gilbert as Leslie Winkle
Wil Wheaton as Wil Wheaton
Adam West as Adam West
Stephen Hawking as Dr. Stephen Hawking
John Ross Bowie as Barry Kripke


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