The Big Bang Theory: Season 9 Episode 17: The Celebration Experimentation
Starring: Johnny Galecki, Jim Parsons, Kaley Cuoco, Simon Helberg, Mayim Bialik, Kunal Nayyar, Melissa Rauch
Length: 19 minutes
On Air Date: 25 Feb 2016
The Big Bang Theory: S09E17 Description: The gang convince Sheldon to celebrate his birthday and throw him a party.