The gang convinces Sheldon to celebrate his birthday and throw him a party.
The Big Bang Theory
The Celebration Experimentation
season 9 episode 17
episode aired on february 2016
Episode rating
Cast of episode
68
26
3
1
1
1
- Sheldon Cooper
- Penny
- Stuart Bloom
- Leonard Hofstadter
- Amy Farrah Fowler
- Barry Kripke
- Leslie Winkle
- Bernadette Rostenkowski
- Raj Koothrappali
- Howard Wolowitz
- Dr. Beverly Hofstadter
- Wil Wheaton
- Adam West
- Stephen Hawking