The Big Bang Theory

The Celebration Experimentation

Season 9    Episode 17
February 25, 2016    19m    TV-PG
72%
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After more than nine years together, the gang finally celebrates Sheldon’s birthday, surprising him with a special guest.
Directed By
Mark Cendrowski
Written By
Tara Hernandez, Chuck Lorre,

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Cast of The Celebration Experimentation
  • Johnny GaleckiLeonard Hofstadter
  • Jim ParsonsSheldon Cooper
  • Kaley CuocoPenny
  • Simon HelbergHoward Wolowitz
  • Kunal NayyarRajesh Koothrappali
  • Melissa RauchBernadette Rostenkowski
  • Mayim BialikAmy Farrah Fowler
  • Kevin SussmanStuart Bloom
  • Sara GilbertLeslie Winkle
  • John Ross BowieBarry Kripke
  • Adam WestSelf
  • Wil WheatonWil Wheaton
  • Stephen HawkingStephen Hawking
  • Christine BaranskiBeverly Hofstadter

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