As Leonard and Penny struggle with the revelation he kissed another woman, Leonard goes to meet the woman in question, Mandy, in a bid to show Penny there's nothing to worry about. Elsewhere, Sheldon films an episode of Fun with Flags alone following his break-up with Amy, who is angered by Sheldon's thinly veiled comments about their recent split.

Meanwhile, Bernadette is uncomfortable with the fact she's known about Leonard's kiss for two years after Howard told her, while Raj is unhappy that he did not share the gossip with him.

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Guest Stars: Melissa Tang as Mandy

Writers: Steven Molaro (Story), Steve Holland (Story), Tara Hernandez (Story), Chuck Lorre (Teleplay), Jim Reynolds (Teleplay), Maria Ferrari (Teleplay)

Director: Mark Cendrowski

Viewers: 15.23 million Households Rating: 10.3/16 Adults 18-49 Rating: 3.8/13

After Sheldon goes to the kitchen in the middle of the night, he finds Leonard already up. Leonard explains he can't sleep because his wife is already not speaking to him after less than twenty-four hours of marriage. When Penny comes over to the apartment having been unable to sleep, she and Leonard wonder what they're going to do to patch things up. Sheldon suggests Penny makes things equal by kissing another person, like Leonard did. Now that he's single, Sheldon throws his hat into the ring, and soon he and Penny are making out. Leonard suddenly wakes up in his bedroom having been horrified by his dream.

When Sheldon video calls Amy, she explains she needs more time away from him to sort through her feelings. Sheldon claims to understand that they're broken up, but he reminds Amy about the "baby" they made together: Fun with Flags. Amy tells him she will not be coming over to film Fun with Flags now they're broken up, and Sheldon's tale of Sonny and Cher working together after their divorce does little to change her mind. Meanwhile, at the comic book store, Raj can't believe the news that Leonard made out with Mandy Chow. Even though the revelation is threatening Leonard's new marriage, Raj is more bothered by the fact Howard knew for two years and didn't tell him.

Sheldon goes to Amy's apartment with a box of her belongings, asking her to check through the box. When Amy finds a red bra among her property, Sheldon insinuates it could belong to any number of women now they're split up, though Amy recognizes it's Penny's bra. Elsewhere, at the Wolowitz house, Bernadette is angry with Howard for telling her about Leonard and Mandy, a secret she's had to keep for two years. Howard doesn't know why Bernadette's mad, so he apologizes for spending a lot of money on a George Clooney "Manscaping" kit.

Back at the apartment, Leonard calls a marriage counsellor to see how much a session costs, but it's more than he can afford. When Penny comes to talk to him, she apologizes for saying everything was okay before they got married. After Sheldon returns home, he suggests that Leonard introduce Penny to Mandy so she can see there's nothing for Penny to worry about. Leonard doesn't like the idea, which makes Penny even more uncomfortable with the idea that Leonard and Mandy see each other at work every day. Penny worries that even if Leonard doesn't have feelings for Mandy, perhaps she has them for him.

As Sheldon films an episode of Fun with Flags alone, he explains to his audience how Amy dumped him. Sheldon then moves onto the topic of the episode, which is countries that split up. Meanwhile, Leonard, Howard and Raj eat at the university cafeteria. When Leonard brings up how much marriage counselling costs, Howard already has an idea because he and Bernadette have occasionally gone to stay on top of their marriage. Raj is upset that Howard didn't tell him that he and Bernadette have been to counselling. When Mandy enters the cafeteria and sits down at another table, Raj and Howard made suggestive comments about how they find her attractive.

When Leonard goes over to talk to Mandy, she can barely remember their kiss during the North Sea expedition. After Leonard explains that he recently got married and had told his fiance about their kiss, Mandy posits that it sounds like he was trying to sabotage their relationship why dredging the kiss up from the past. Leonard admits that, on some level, he's always felt like he doesn't deserve a girl like Penny. Not taking the hint that Mandy isn't that interested in his personal problems, Leonard continues to sound off on his relationship with Penny. Elsewhere, Amy is furious when she watches Sheldon's latest episode of Fun with Flags, which features barely veiled references to their relationship split.

In her apartment, Leonard tells Penny he has something to say to her. Leonard admits that Penny might have been right when she told him he was trying to sabotage their relationship as they drove to Vegas to get married. Leonard says it's not too bad as he thinks he knows why he did that: he doesn't deserve Penny. She calls that a lame excuse but admits she gets it. Penny has the same worries that Leonard might one day leave her for someone more like himself. Leonard says they should stop being so scared and just be together. After a romantic and then cheesy speech about how he feels for Penny, Leonard gets down on one knee and asks her to stay married to him. Leonard and Penny go off to her bedroom to make their marriage official.

Back in the apartment, Leonard and Penny are surprised that Sheldon got them a wedding gift: plane tickets and hotel reservations for a weekend away in San Francisco. Leonard and Penny think the trip sounds great, even if Sheldon is coming with them. A furious Amy arrives to demand Sheldon take the latest Fun with Flags down from the Internet. After Amy leaves, Sheldon comments that Amy watched the episode so he's going to get the girl back. From the other side of the door, Amy yells that she only watched it because he emailed it to her. Sheldon takes Amy listening through the door as a sign she wants him back.