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The Big Bang Theory S9E17 poster

Watch The Big Bang Theory – Season 9 Episode 17: The Celebration Experimentation

The Big Bang Theory • Season 9, Episode 17 • 19 min • 2007 • ⭐ 7.9/10 • Comedy

Cast: Jim Parsons , Kaley Cuoco , Johnny Galecki , Simon Helberg , Kunal Nayyar , Melissa Rauch , Mayim Bialik

Directors: Chuck Lorre , Bill Prady

Watch The Big Bang Theory – S9E17

Episode Overview

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

Episode Navigation

← Previous Episode Back to Season 9 Series Overview Next Episode →

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