The Celebration Experimentation
The Big Bang Theory – Season 9
After more than nine years together, the gang finally celebrates Sheldon’s birthday, surprising him with a special guest.
Cast
Johnny Galecki
Leonard Hofstadter
Jim Parsons
Sheldon Cooper
Kaley Cuoco
Penny
Simon Helberg
Howard Wolowitz
Kunal Nayyar
Rajesh Koothrappali
Melissa Rauch
Bernadette Rostenkowski
Mayim Bialik
Amy Farrah Fowler
Kevin Sussman
Stuart Bloom
Sara Gilbert
Leslie Winkle
John Ross Bowie
Barry Kripke
Adam West
Adam West
Wil Wheaton
Wil Wheaton
Stephen Hawking
Stephen Hawking
Christine Baranski
Beverly Hofstadter
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