"The Monster Isolation" is the seventeenth episode of the sixth season of the American sitcom The Big Bang Theory. This episode first aired on Thursday, February 21, 2013.
In this episode, Raj becomes a hermit after Lucy dumped him on their first date. Meanwhile, Sheldon invites Penny as his special guest for a Fun With Flags and was later invited to watch her class play A Streetcar Named Desire.
Raj and Lucy, the girl who left with him after the Valentine's Day party at the comic book store, are having coffee the same evening. Raj tells her how he went to Cambridge University, which reminded him of Hogwarts, where he fell in love with astronomy. "Raj is my name and stars are my game. And rhyming is also my game." He then asks about her, but first she excuses herself to go to the restroom. Raj thinks that everything is going great until we see Lucy passing the front window leaving him unaware that he's alone.
The next day, Sheldon is taping a Fun with Flags episode in his apartment. He apologizes to the audience for not airing an episode last week because Leonard pointed out that when he dressed up as George Washington Carver for Black History Month that that show was racist. Penny is Sheldon's guest and is described as a flag virgin, but not a real virgin since she has had coitus. Penny joins him and says that she has many times been at parties and has not been able to join in the discussions about flags. Penny stops the taping and shows him how to loosen up using things she learned in acting class like talking to his guest and not to the camera. Also he should have his arms opened instead of crossed thus welcoming everybody in. Sheldon mentions that he has gotten comments about his robotic delivery and that that must not be a compliment. Sheldon then looks too relaxed almost like Penny and he are a couple. Penny then says that she is from Nebraska so Sheldon shows her and describes the Nebraska state flag now sitting stiffly. Following on Penny's earlier comments, he tells her to spread her legs and invite everyone in.
Howard, Bernadette, and Leonard go to visit Raj after not hearing from him for a few days. Howard says that he can always feel when Raj is in trouble. Bernadette asks how close were the before she met him. Leonard tells her to not look under that rock. They get him to open the door after he complains that nothing good ever happens to him. Inside they find Raj moping over Lucy looking terrible and his apartment is a wreck. Raj tells them that he was humiliated by yet another woman. Howard asks him if he chopped her up and if that was what they smelled. Raj explains that he took her to get coffee and that she left. She had climbed out a very tiny window in the bathroom meaning that she was highly motivated to leave. The guys tell him that he has to shake himself out of his depression; however, he claims that he is never going to leave his apartment, especially since he can order anything from Amazon including lobster. Howard and Leonard find this last point interesting since they could put together an order of Surf and Turf. Bernadette wakes them up since they want to get Raj out and not get themselves settled in. Raj tells them to leave him alone and goes into the bedroom. Before they leave Bernadette says they could talk about it over lobster, saying only she had the decency to wait on her lobster craving until he left the room.
Sheldon is video chatting with Amy who is monitoring her cigarette- addicted monkeymonkeys who are now going through withdrawal and are getting on her nerves. She preferred working with her marijuanamarijuana-addicted flatwormsflatworms. He tells her that his "Fun with Flags" episode went well and that Penny's acting tips were very helpful. He demonstrates opening his arms and saying "Welcome to my world" and subsequently folding his arms and saying "Not welcome to my world", mentioning that he has a very powerful tool and has to learn how to control it. Amy asks if he told Penny that she was helpful and had done a nice job and Sheldon had not. Amy says that she is his friend and that he should. To Amy's surprise he immediately walks away to do it. After Sheldon walks away, Amy is irritated by her screaming monkeys once again and exclaims: "Yeah, Yeah, you'd like a cigarette. Well, I'd like a normal boyfriend so deal with it!"
Penny walks out her door with the trash not giving Sheldon a chance to knock. She asks if she should close the door until after he does his knock, but Sheldon says that he's fine since he had not started. He then tells Penny that he was thinking about her performance and thanked her for the great job she did. His comments included using her name three times, each time with three taps on the door completing his knocking sequence. Penny tells him that his compliment made her day. Penny then invites Amy and him to her acting class play on Friday night. Sheldon walks away and says that he is not interested in that. Back at his computer, Amy is seen teasing her monkeys by not giving them their cigarette lighter. Sheldon tells Amy about the play and Amy tells him that he was rude not accepting the offer since she had helped him out. Sheldon complains about all the crazy rules as the monkeys start to throw their faeces at Amy. Back at Penny's door, at first Penny doesn't want him to come under obligation. Then they argue about how he "wants to go because he has to want to go". Finally Sheldon tells her that it's just easier for him to go even if he doesn't want to.
At the comic book store, Sheldon mentions how he hasn't seen Raj lately and if he is now out of their social group, Sheldon wants to add a friend who is Latin. Howard tells Sheldon that Raj has decided to never leave his apartment again. Sheldon thinks that that idea is brilliant and wishes he could do it. Lucy enters the comic book store and approaches Stuart. She asks if he remembers her, and Stuart mentions that she left the party with Raj, which gets the guys' attention. Howard tells her that he is Raj's best friend and that Raj is devastated. Lucy says that she is sorry and asks Howard to give Raj a note. Howard replies that Raj is a proud man and that if she walks out again, she is only going to have five or six more chances.
Howard is sitting in Raj's apartment and he is now dressed in only tighty-whities underpants and a plastic bib eating lobster. Howard shows Raj the note, and tells him that he should celebrate and call her. Raj doesn't want to call her and replies that he is going to be a monk, and renounce all his worldly pleasures except eating lobster. Raj tells Howard that he is a good friend, but he has made his choice. Howard leaves with Lucy's note. After Howard leaves, Raj runs down the street in his underwear and boots to get the phone number back from Howard.
Leonard is getting ready to go to Penny's play and asks Amy how her monkey addiction project is going. Sadly, she is no longer associated with that project since she was flinging their feces back at them and was called unprofessional. Leonard tells her that he is sorry and under his breath adds "that he asked". Sheldon enters the living area reluctant to go to the "stupid" play. First Sheldon is forced to give Leonard several gaming systems: a Nintendo DS, a PSP and a Gameboy. Then Sheldon gives Leonard a Rubik's Cube, and gratefully hands Leonard a Etch-A-Sketch drawing board (when Sheldon finally hears the play's name, A Streetcar Named Desire, he gets excited because he thinks it will be about actual streetcars).
Lucy hesitantly walks up to Raj's door and knocks. Raj and his place have been cleaned up. Lucy says that she can't stay and that running out on him was not cool. Raj asks why she ran out on him. Lucy replies that she has a hard time around people she doesn't know. She had seen the flyer about the party and forced herself to come to get out of her comfort zone. Lucy doesn't even like comic books. Raj first agreed with her and then said that he did like them. Lucy tells him that she is kind of broken and then Raj told her that he was too. She said he wasn't. Raj then admitted that he couldn't talk to her without his beer and that he has major psychological problems. Though Lucy thinks he might not be telling her the truth, she agrees to go on another date to find out.
Penny is on a small stage performing as Blanche DuBois in "A Streetcar Named Desire." Sheldon is wondering when the streetcars come in. Leonard is engrossed in Penny's performance and even Sheldon says that she is remarkable. Amy calls her friend a star. Sheldon wonders how she can remember all those lines and yet forget to leave out the tomato on his hamburger when she is working waitressing.
- Title Reference: Raj is attempting to isolate his own monster, or social problem, to find love.
- We heard that Raj attend Cambridge University with his sister Priya.