The Big Bang Theory (2007–2019)
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The Celebration Experimentation 

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


Mark Cendrowski


Chuck Lorre (created by), Bill Prady (created by) | 6 more credits »





Episode complete credited cast:
Johnny Galecki ... Leonard Hofstadter
Jim Parsons ... Sheldon Cooper
Kaley Cuoco ... Penny Hofstadter
Simon Helberg ... Howard Wolowitz
Kunal Nayyar ... Raj Koothrappali
Mayim Bialik ... Amy Farrah Fowler
Melissa Rauch ... Bernadette Rostenkowski
Kevin Sussman ... Stuart Bloom
Christine Baranski ... Dr. Beverly Hofstadter
Sara Gilbert ... Leslie Winkle
Wil Wheaton ... Wil Wheaton
Adam West ... Adam West
Stephen Hawking ... Stephen Hawking
John Ross Bowie ... Barry Kripke


Sheldon's birthday is approaching, and Amy wants to throw him a party despite he not ever having wanted a birthday party in the past. When Amy, Leonard, and Penny learn the reason why he's never wanted a party, they assure him that this one will make up for the disappointments that were his birthday parties when he was a child. In trying to figure out what to get him for a present, Leonard, Howard and Raj decide that what would make up for those childhood party disappointments would be to have a Batman show up, specifically in the form of Adam West. Even with all the details of what Sheldon wants for his birthday, such as a three layer chocolate cake with strawberry frosting, Sheldon will have to overcome a lot of bad memories to make it through what his friends want to be a good party for him. Written by Huggo

Plot Summary | Add Synopsis


Comedy | Romance


TV-PG | See all certifications »






Release Date:

25 February 2016 (USA) See more »

Company Credits

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Technical Specs


Sound Mix:




Aspect Ratio:

16:9 HD
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Did You Know?


It is observed in this episode that Howard and Bernadette are not wearing their wedding rings. Being newly pregnant, her hands have not begun to swell yet. See more »


Several guest arrive for Sheldon's birthday party: Leslie Winkle, Barry Kripke, Wil Wheaton and Leonard's mom. It would seem logical that Sheldon's own mother should have been there. See more »


[first lines]
Amy Farrah Fowler: [as they walk down the stairs] So, Sheldon, there's something I've been wanting to talk about, but I know it's kind of a touchy subject.
Leonard Hofstadter: Way to narrow it down to everything.
Sheldon Cooper: What is it?
Amy Farrah Fowler: Well, your birthday's coming up, and you've never let us celebrate it, and I was hoping maybe this year we could.
Sheldon Cooper: Oh, I suppose that's a discussion we could have.
[he runs back upstairs]
Amy Farrah Fowler: OK, great. I mean, it doesn't have to be a big party or anything. I just...
[she notices he isn't there]
Amy Farrah Fowler: Where'd he ...
See more »

Crazy Credits


Nine years.

Two hundred episodes.

There are no words to express our gratitude for your support.

Oh wait! Maybe there is.

Bazinga. See more »


References Batman v Superman: Dawn of Justice (2016) See more »


History of Everything
Written by Barenaked Ladies
Performed by Barenaked Ladies
[Series theme song played during the opening titles]
See more »

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User Reviews

Sheldon charm doesn't work anymore
26 February 2016 | by Arianrhod_BSee all my reviews

Since Sheldon's character became so popular and likable, the show pretty much concentrated on him, rather than other characters who became later on side characters. And then this got too obvious and predictable that the show needed new characters, nevertheless, when got stuck, the writers used the "Deus-Ex Machina Sheldon" tool again just to invent something out of Sheldon's past and then make the whole episode about him.

This became so predictable like we're literally saying "OK now what's next?" and then yawning. This episode is entirely focused on Sheldon and even the story is not convincing. I bet they'll include his sister very soon. In fact, you can all predict everything already:

1) When will Amy and Sheldon get married? 2)Leonard and Penny will def. have a baby soon 3)Raj may have another "nerd" girlfriend

And then yawn. The writers probably ran out of stories already. That might explain why they jump in another "Sheldon themed" episode and again, again and again.

PS: Is this the 200th episode that they made such fuss about? No way!

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