The Big Bang Theory: S09E17 - The Celebration Experimentation

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The Celebration Experimentation

The Celebration Experimentation
Season: 9
Episode: 17
Air date: 2016-02-25

Guest stars: John Ross Bowie, Sara Gilbert, Stephen Hawking, Wil Wheaton, Christine Baranski, Kevin Sussman, Adam West

After more than nine years together, the gang finally celebrates Sheldon’s birthday, surprising him with a special guest.