- The gang convinces Sheldon to celebrate his birthday and throw him a party.
- 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.—Huggo
- Sheldon, Amy, Leonard and Penny are descending the staircase and Amy wants to ask Sheldon that since they never let him celebrate his birthday, that this year they could. Sheldon agrees that that is a discussion they could have and then he disappears up the stairs.
Entering the apartment Penny wonders where Sheldon is. As Leonard goes off to check his room, Sheldon jumps out from behind the couch and shouts "Surprise!" scaring them. "Just one example how birthdays can be terrible," exclaims Sheldon. He shared his birthday with his twin sister. No one he invited would come though he never liked any of them much anyway. His sister and her friends would always be mean to him like when he was six they told him that Batman was coming. He waited by the window for hours. Amy assures him that they would never hurt him like that. Sheldon made her last birthday so memorable, she wanted to return the favor. Eventually, he reluctantly accepts a party with cake, presents and demonstrations of admiration and love; however, Amy owes him "big time".
The guys are at the comic shop and Howard asks Raj what he's getting Sheldon for his birthday. Leonard then thinks of the idea to invite a real Batman to his party due to Sheldon's bad childhood experience. He then asks Stuart for Adam West's contact info since Stuart tried to get him for a comic book signing for his store. Stuart gives it to them, but warns them that he is something of a diva.
Meanwhile at 4A, the ladies are asking Sheldon what he wants at his party. He would like a three layered chocolate cake with strawberry frosting. No messages on the cake in capital letters since he doesn't like his cake yelling at him. Mylar (foil) balloons, not latex. And if Amy brings water balloons, he'll jump off the roof and aim for her car. As for music, he likes marching bands and Tibetan throat singing. Penny nixes the music.
Leonard, Raj and Howard in Leonard's car going to pick up Adam West and they start getting into a debate over who is the best Batman. For Raj is Michael Keaton, Christian Bale, Lego Batman and then Adam West.
At the apartment. Penny, Stuart and Bernadette are there decorating. Stuart is frosting his cake, and is glad to have been invited. Barry Kripke enters and asks Bernie how the glowing mother-to-be is doing. Stuart is hurt that Bernie never told him she was pregnant.
Adam West is now in the car. also discussing the best Batman actors. Adam West states that Christian Bale is overrated. Raj adds that he thought Michael Keaton brought a sense of humor to the role. Adam scoffs saying that if you're factoring in humor, HE should be number one. West, Keaton, Kilmer, Lego, Bale and that pretty boy Clooney. Howard thinks that Bale should be higher since he personified the term "I'm Batman. Adam West had his own muscles and none were built into his costume, unlike everyone else. He also is not aware of Ben Affleck being the next Batman.
At Penny's apartment, Sheldon and Amy are getting ready. Amy is helping Sheldon with his tie waiting for Penny to call them.
In 4A, everyone is there. Leonard and Penny are talking to his mother. He wonders why she came so far and it was because he came to her sixtieth. Leonard hadn't been invited or notified about this before. Penny adds that to be fair, they did get married in Las Vegas and didn't invite her.
Back in Apartment 4B, Amy got a text from Penny saying that it was okay for them to come over and as they're walking, Once they open the door, everyone jumps and yells "Happy Birthday" and asks him to make a public speech. Sheldon thanks everyone for coming. Beverly, Wil Wheaton, Adam West says, "Happy Birthday, Sherman." He starts to hear his own heartbeat loudly and then retreats to the bathroom to hide.
Once he runs off, Leonard suggests that he talk to him. Penny rushes off to confront Sheldon. The whole party of people and presents was just too much for him. Sheldon is one of her favorite people and if he wants to spend his party in the bathroom, she is staying there with him. Sheldon thinks that people will think that he is weird. Penny retorts that he is weird, everyone knows he is weird, yet they still came to the party to honor him because they love him so much. Kripke then knocks on the door because he needs to check his hair since he might have a shot with Beverly.
Leslie (Sara Gilbert) approaches Leonard and mentions that it has been quite a while and that so much has changed. He adds that Penny and him got married. She offers her congratulations.
Penny comes out announcing Sheldon's return. Sheldon apologizes for his behavior and tells everyone to enjoy themselves. Amy then proposes a toast to him. She says that it is customary for the birthday boy to receive the presents, but she feels that she got the greatest gift the day he was born. Howard then says that he has known him for a long time and it is a pleasure to work with him and to say that he is his friend. Wil Wheaton says that despite their ups and downs, his life is so more interesting because he is in it. Sheldon may be a fan of Star Trek, but Wil is a fan of Sheldon Cooper. Beverly says that the future holds great things for him and they all can't wait to see what they are. Raj is quoting Gandhi and Sheldon just wants him to speed it up. Leslie Winkle mentions that in the past she would have said something obnoxious like "Happy Birthday, Dumbass," they have both grown and it is just nice to see everyone again. Sheldon adds that he doesn't like change so Leslie shouts, "Happy Birthday, Dumbass!"
Bernadette has nothing to add that hasn't already been said, "So here's to you, Sheldon." Leonard says that he can't remember a time when he wasn't in his life though he tries. He makes him laugh, makes him a better scientist and makes him crazy. He's not his friend, he's his brother. Stuart tries to speak, but Amy interrupts him with a Skype call. Stephen Hawking slowly wishes him a Happy Birthday until they realize he is singing the song. Leonard asks him to pause while they light the cake candles and all do it. Penny makes Sheldon hug her. Finally, they sing to Sheldon with Hawking finishing last. Sheldon blows out the candles and everyone cheers. West then demands that someone take him home.
Title reference: Sheldon allows the group to experiment by giving him a birthday party.
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