The Big Bang Theory

The Celebration Experimentation (Season 9, Episode 17)

TV-PG

TV Episode | 19 min | Comedy, Romance

The gang convinces Sheldon to celebrate his birthday and throw him a party.

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Cast	+ Add Cast
14 cast members

Name	Known for
Johnny Galecki Leonard Hofstadter Leonard Hofstadter See fewer	The Big Bang Theory (2007)
Jim Parsons Sheldon Cooper Sheldon Cooper See fewer	The Big Bang Theory (2007)
Kaley Cuoco Penny Hofstadter Penny Hofstadter See fewer	The Big Bang Theory (2007)
Simon Helberg Howard Wolowitz Howard Wolowitz See fewer	Florence Foster Jenkins (2016)
Kunal Nayyar Raj Koothrappali Raj Koothrappali See fewer	The Big Bang Theory (2007)
Mayim Bialik Amy Farrah Fowler Amy Farrah Fowler See fewer	Beaches (1988)
Melissa Rauch Bernadette Rostenkowski Bernadette Rostenkowski See fewer	The Big Bang Theory (2007)
Kevin Sussman Stuart Bloom Stuart Bloom See fewer	Burn After Reading (2008)
Christine Baranski Dr. Beverly Hofstadter Dr. Beverly Hofstadter See fewer	Mamma Mia! (2008)
Sara Gilbert Leslie Winkle Leslie Winkle See fewer	Poison Ivy (1992)
Wil Wheaton Wil Wheaton Wil Wheaton See fewer	Stand by Me (1986)
Adam West Adam West Adam West See fewer	Batman (1966)
Stephen Hawking Stephen Hawking Stephen Hawking See fewer	Star Trek: The Next Generation (1987)
John Ross Bowie Barry Kripke Barry Kripke See fewer	Speechless (2016)