- Sheldon's comic book store experience changes when writer Neil Gaiman puts Stuart's store on the map; friendships are threatened when Koothrappali takes credit for Penny's astronomical discovery.
- Raj sets up his telescope and computer on the apartment building roof with most of the gang in attendance. The project is to watch the planet Mercury at the greatest height of its elongation. Amy looks over the side of the building and calls to Sheldon that the roof is pigeon-free. Sheldon comes running onto the roof ready to see planets. Penny wonders why Raj didn't use Leonard's telescope since it was downstairs. Raj scoffs that this is much better since it was a professional instrument. Stuart gets excited that author Neil Gaiman reviewed Stuart's comic book store favorably in a tweet. Stuart thought that he could remember the author being in the store, but the whole gang was arguing about the best comic genre metal when he visited and they missed him. Stuart announces he starts to get quite a few twitter followers. After Raj adjusts the telescope, he turns it over to Penny. She sees something fuzzy in the sky and Raj has her take a picture of it. Viewing it on his computer screen Raj thinks that Penny saw a comet.
At the comic book store, the place is full of customers as Sheldon and Howard arrive. Sheldon complains that he preferred the store before, empty and sad. Now where was Sheldon going to hang out and read a comic book? If Sheldon is going to sit, read a comic and ignore a woman, he can do that at home with his fiance. He is also annoyed because Stuart is out of the comic Sheldon wanted to buy.
In Leonard and Penny's apartment, Raj joins them and announces that they indeed did see a comet and that no one else had reported it so they get credit for discovering it. Penny is excited that she discovered it, though Raj adds that it was with his telescope that he positioned it so that she could see it. Leonard says that both of them can have their names on it; however, Raj put on the paperwork in his name only. Penny insists that she saw it first and she took the picture. Raj asks her that if a monkey took the picture, would he have discovered it? Then Penny get mad and throws him out.
The Wolowitzes are all dressed up for their date night out; however, Stuart can't make it since the store is so busy. He apologizes and Bernadette is not really angry. Howard is sorry that they are getting the dinner and romance they wanted. She divides it up by going out to dinner and Howard stays home with the Internet to have the romance.
Penny is on the Internet and finds out that the person that takes the picture discovered the comet and that that was her. Raj stole her comet. She feels that it happens all the time because people look at her and don't think she knows what she is talking about at work.
At the comic book store, Sheldon tries to make a point to Howard when he realizes he is trying to talk to a stranger which scares him. He tries to admit that he can accept change more now because he was fine with Amy changing her shampoo. Next Sheldon goes to check out and meets Denise (Lauren Lapkus), the new assistant store manager. Sheldon yells, "Nope!" and runs out of the store.
Back at home, Sheldon is complaining about the changes since he has spent thousands of dollars there. Sheldon compares the store to the country in the "Black Panther" movie and complains about the new woman at her store. Amy is sure that someone is going to get offended. Amy also offers the suggestion that he thinks of her as a friend that he hasn't berated, lectured or condescended to yet. Sheldon thanks her, calls her wise and that she smells like books.
Leonard visits Raj and asks him to include Penny in the discovery. Raj explains that his boss was so excited that he called him "Captain Comet" instead of his usual "Dr. Doughnuts". Then Raj starts calling himself a bad person and a bad scientist so Leonard caves and says that he'll talk to Penny...and may end up sleeping on Raj's couch.
Sheldon is watching Denise while Howard comments that she seems to know her stuff. Sheldon takes that as a challenge so he approaches her and asks her to recommend something without saying what he likes. She offers a DC alternate history comic which gets Sheldon excited. Neil Gaiman is back and mentions his alternate history story "1602" when Sheldon brushes him off. Denise even offers to take it back if he doesn't like it; but he can't tell Stuart.
Leonard returns to tell Penny that he talked to Raj, but Penny quickly figures out he caved in. Leonard replied that she is a strong and independent woman with her own voice, like Katy Perry. "Go out and roar."
Bernadette enters the dining room and finds that Howard has cooked dinner for an in-house date night. Bernadette loves it until Stuart shows up. Denise is running the store that night. His funny story is that he ran out of his cash register tape due to the new business and he didn't know how to change it. Bernie decides to leave dinner for Stuart and they can go out.
At dinner, Sheldon keeps talking about Denise and the great time they had together talking about comic books. Amy storms down there and introduces herself to Denise as his fiance. At first Denise didn't believe that Amy was real. Amy tells her directly what was going to happen next. Denise was going to teach her to talk about comics like she really liked them. Denise really does.
Raj hears Penny coming up the stairs and knows that her feet sound angry. He apologizes first and Penny says that she is angry at him. He calls himself a jerk and says that he'll add Penny's name even if it's professionally embarrassing and that he'll be on thin ice at work. Penny says that that was good, says "bye" and leaves. Closing the door Raj remarks that his dark side approach worked better with Leonard.
Amy is reading a DC universe book that she got at the comic book store when Sheldon comes home. She starts to talk to him about what she has learned; however, Sheldon says that he talked enough about comics books. Amy throws the book onto the coffee table in disgust.
Title reference: Raj and Penny polarized over who deserves credit for discovering the comet.
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