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The Big Bang Theory Season 9 Episode 17
After more than nine years together, the gang finally celebrates Sheldon’s birthday, surprising him with a special guest.
Serie: The Big Bang Theory
Director: Mark Cendrowski, Nikki Lorre
Guest Star: Adam West, Christine Baranski, John Ross Bowie, Kevin Sussman, Sara Gilbert, Stephen Hawking, Wil Wheaton
Episode Title: The Celebration Experimentation
Air Date: 2016-02-25