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The Big Bang Theory

Series 9 Episode 17: The Celebration Experimentation

For the first time, the gang celebrates Sheldon's birthday by surprising him with a special guest.

Original air date
Cast and crew
  • Mark CendrowskiDirector
  • Johnny GaleckiLeonard Hofstadter
  • Jim ParsonsSheldon Cooper
  • Kaley CuocoPenny
  • Simon HelbergHoward Wolowitz
  • Kunal NayyarRaj Koothrappali
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