- Leonard moves in with Penny after a fight with Sheldon, which causes Amy to want to move in with Sheldon. Meanwhile, Raj has a frightening experience with Howard's mother.
- After one insensitive and self-serving move too many by Sheldon, Leonard has had it with him and decides to move out, even throwing the roommate agreement into the garbage. While Sheldon doesn't understand or want Leonard to move out, Sheldon will not apologize for what he sees as no wrongdoing on his part nor will he beg Leonard to stay. Unilaterally, Leonard decides to move in with Penny, who doesn't have the confidence to tell him that she doesn't want him to move in since she doesn't believe their relationship is yet at that stage. With an extra bedroom now in Sheldon's apartment, Amy sees it as her opportunity to get closer to Sheldon by becoming his new roommate. Sheldon, in turn, doesn't want Amy as a roommate, although he can't tell her not to move in since all her arguments are logical, and thus ones he can't refute. Will Penny and/or Sheldon eventually accept their new roommates, or will this new set-up cause problems to make Leonard and/or Amy reconsider? Meanwhile, Howard convinces a reluctant Raj to look after his mother while he and Bernadette are out of town. Raj ends up feeling like a second Howard, who can't physically leave Mrs. Wolowitz's house.—Huggo
- Leonard immerses himself in the sixth installment of the "Harry Potter" series. Sheldon thoughtlessly ruins the surprise by revealing that Dumbledore meets his demise. Irritated by Sheldon's lack of consideration, Leonard points out that had he been the one to spoil a major plot point, Sheldon would have complained endlessly. Leonard counters by expressing his frustration with Sheldon's annoying and controlling nature, as well as his dissatisfaction with their current living arrangement. He reiterates that Sheldon is, without a doubt, the most vexing person he knows before storming off. In response, Sheldon cites the provisions of the Roommate Agreement, but Leonard dismisses it by disposing of the contract. Unfazed, Sheldon cites section 27, paragraph 5, comparing it to the American flag that should not touch the ground. As Leonard departs the apartment, Sheldon adds that Dobby the Elf meets his demise in the seventh Harry Potter book.
Meanwhile, at Howard and Bernadette's apartment, Raj returns Howard's borrowed suitcase, which he had kept for two years. The Wolowitzes are preparing to attend a conference in Las Vegas, accompanied by some of Bernadette's colleagues. Bernadette reveals that the purpose of the trip is to re-brand a dandruff shampoo that previously caused digestive problems as a constipation cure, opening up new revenue streams for the company. Concerned about his mother, who has been depressed since her dentist boyfriend broke up with her, Howard asks Raj to check in on her. Raj initially complains about being single and having Saturday as his party night, but Howard dismisses his objections, and Raj agrees to fulfill the task.
Meanwhile, at Penny's apartment, Leonard shares his frustrations with Sheldon, describing him as egotistical and insufferable. Penny jokingly remarks that they make a cute couple, like Bert and Ernie from Sesame Street, who taught her about words and numbers. Leonard announces his inability to continue living with Sheldon for another minute and expresses his desire to move in with Penny. Nervous about the idea, Penny hesitates. Leonard, oblivious to her concerns, starts making plans to move in.
At Mrs. Wolowitz's house, Raj finishes dinner with her, declining dessert at first. Feeling lonely and purposeless, Mrs. Wolowitz confides in Raj, who then agrees to stay for dessert, prompting her to promise him a chocolate cheesecake.
Meanwhile, Sheldon assists Amy in packing a box of Leonard's collectibles. Amy seizes the opportunity to propose moving in with Sheldon, leveraging her understanding of his quirks and idiosyncrasies to improve her chances. She confidently states that she is an ideal fit and begins making plans to move in, mirroring Leonard's decision with Penny. Overwhelmed, Sheldon seeks Leonard and Penny's help, begging Leonard to return and promising to make changes to the Roommate Agreement. While Penny acknowledges Sheldon's concerns due to her own feelings, Leonard remains unfazed by Sheldon's pleas, choosing to ignore him.
Concerned about Raj, Howard visits Mrs. Wolowitz's house and discovers Raj in his old bed, dressed in his silk pajamas. Mrs. Wolowitz calls them for breakfast, and Howard warns Raj that his mother will hold him captive. Raj remains skeptical until he realizes his clothes have been hidden.
Back at the apartment, Sheldon confronts Penny about the situation, unaware of her unintentional involvement. Sheldon asserts that the current state of affairs is untenable because of her and Leonard. Penny agrees with him, admitting her hesitation to have Leonard live with her while expressing her desire not to break Leonard's heart because she loves him. They both conclude that they need to be honest with their respective partners.
In Las Vegas, Howard and Bernadette find themselves applying ice packs due to a failed sexual experiment. Raj urgently contacts Howard through a video chat, seeking help. Howard dismisses him, joking that Raj wanted a woman in his life and now he has one. Bernadette wonders if they should go rescue him, but Howard suggests they wait.
Back in apartment 4A, Amy serves Sheldon spicy food prepared exactly to his liking. Curious about the impact of them living together on the mystery of their relationship, Sheldon questions Amy, who reassures him that it won't eliminate the mystery. She then presents him with a script for their phone answering machine message. Sheldon firmly states that the situation cannot proceed, devastating Amy. Angrily, she confronts Penny about Sheldon's deception, and both Amy and Penny retreat to Penny's apartment, leaving Leonard and Sheldon to return to their own apartment and watch an episode of "The Walking Dead." Sheldon accidentally lets a spoiler slip, but quickly assures Leonard that it is ambiguous.
In the final scene, Raj remains trapped in Mrs. Wolowitz's house, unsuccessfully attempting to escape.
Title reference: The episode revolves around the theme of spoilers, starting with Sheldon spoiling the ending of "Harry Potter and the Half-Blood Prince," which prompts Leonard to consider moving in with Penny.
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