The Celebration Experimentation

Sheldon and the gang celebrate his birthday, and he's surprised by a special guest. Adam West appears.

Season 9 | Episode 17
TV-14-DL
PRESENTED BY
Cast

Jim Parsons

Sheldon Cooper

Johnny Galecki

Leonard Hofstadter

Kaley Cuoco

Penny

Simon Helberg

Howard Wolowitz

Kunal Nayyar

Raj Koothrappali