The Big Bang Theory S9E17 backdrop
The Big Bang Theory poster

The Big Bang Theory (2007)

S9E17 The Celebration Experimentation

Feb 25, 2016 Season 9 Episode 17 Comedy

After being together for over nine years, the group finally throws a surprise birthday party for Sheldon, inviting a special guest to join in the celebration.

Previous S9E16
All Episodes
Next S9E18