Plot

An impending change to his living arrangements inspires Sheldon to revert to 2003, before he met Penny and Leonard. Raj and Howard form a band for the comic book store.

Leonard and Penny finally move in together leaving Sheldon very upset with this big change in his life and wishing he could go back to a time when he had no emotions in 2003 before he met Leonard. Raj, Howard and Stuart attempt to form a band.

Leonard and Penny have finally made the decision for Leonard to move into her apartment, Leonard relinquishing all his rights to his and Sheldon's apartment. They try to soften the blow in delivering the news to Sheldon, whose mind changes on the issue when Bernadette informs him that he could find a better roommate than Leonard. When finding that replacement doesn't come as easily as Sheldon thought, he reverts back to what he considers the last stable time in his life, namely just before he met Leonard in 2003. That drastic change to living life like he did twelve years ago may give Leonard and Penny some pause about what their moving in together will do for their collective lives. Meanwhile, Stuart is looking for a band to play for free at the store. Howard and Raj believe they can fulfill both Stuart's request and their lifelong dream by forming a band of their own. Their concept for a band is even the same of folk-oriented acoustic sci-fi inspired music. But is a concept enough to sustain their band, especially when they may be working on different priorities?—Huggo

Leonard, Penny and Sheldon are returning from the container store with an extremely happy Sheldon until he notices them taking his new bin to Penny's apartment. Penny tells Sheldon that since they are married it makes sense for Leonard and her to be living together. Sheldon gets upset claiming that the whole wonderful day was to deliver bad news to him.

Sheldon is visiting Bernadette to seek female comfort and encouragement about Leonard moving out to live with Penny since his relationship with Amy is strained. Bernadette was honored that he turned to her until she found out she was picked after his mother, Leonard's mother and his Meemaw were unavailable making her seventh. Sheldon is feeling abandoned so Bernadette suggests that this is an opportunity to find a new roommate since he has had others in the past. Sheldon muses that maybe he could get Chris Pratt. Bernadette then suggests that he take Stuart as his roommate; however, Stuart says that he is much too happy living with them.

Stuart, Raj and Howard are hanging out at the comic book store and Raj finds a comic book where Archie is taking on Predator. Stuart asks if the guys know any musicians since he would like to have live music in the comic book store a few times a week giving the place a "staying in business" vibe. Raj and Howard have always wanted to play together. Raj wants to play folk music, a mixture of folk and sci-fi themes. Howard likes the idea and even has a band name he has been holding since middle school - "Footprints on the Moon''.

Sheldon and Leonard are going over the paperwork to officially 'unroommate' him. Leonard has to return his apartment key and then as his new neighbor Leonard gets an apartment key. Also he signs up for the ten year roommate reunion and turns ownership of the couch over to Sheldon in every parallel universe. Leonard signs out of annoyance.

Raj and Howard are working on their folk song. Raj suggests a David and Goliath story where the Norse god Thor goes up against Indiana Jones. The hammer versus the whip which blows Howard's mind. "Thor and Dr. Jones. One plays with lightning and the other plays with bones."

Sheldon starts to interview new roommate applicants and asks the chemist which element on the periodic table is too big for its britches. The answer is argon. The next candidate is asked if on average his Odor smells better or worse than he does at the present time. The next one is dismissed because he has a Band-Aid on his arm. Up next, he describes the candidate as being healthy and in the sciences, though he is running a credit check. He is on Skype with Amy who is not going to be his roommate. Eleven people have walked out on him. Sheldon blames Leonard, Penny and Amy with poisoning him with emotions. He's like the Tin Man who was given a heart by the wicked wizard.

Penny and Leonard are going out to eat and Leonard suggests the usual weekly Thai food. Penny tells him that he can choose anything he wants since he no longer lives with Sheldon. He goes through a dozen possible cuisines and finds himself most comfortable with Thai food. They run into Sheldon in the lobby who has reset himself to his 2003 self. He is too emotionally vulnerable and is going back to his last stable version like any operating system before he met Leonard and had to deal with emotions. Therefore, he doesn't know who they are since he hasn't met them and they must exit the premises before he calls the police on his new stylish flip-phone.

At dinner, Leonard is still worried about Sheldon. Penny explains that he is fine and is just a man in his 30's living like he is a man in his 20's. Leonard can set the thermostat to whatever temperature he wants and go to the bathroom at any time. He still feels like they are abandoning him though he can still be contacted on Facebook once they invent the iPhone in his universe.

Bernadette and Amy are having a drink with Amy saying that she can't believe Sheldon ran a credit check on her. Bernadette offers her a $1000 bill, to take in Stuart if she is looking for a roommate. Amy declines.

Penny and Leonard visit the apartment which is now empty except for two lawn chairs, the TV on cinder blocks and a giant cable reel for a table just as Leonard found it when he first met Sheldon. It is now 2003. Everything has been moved into the spare bedroom. Sheldon is dealing with everyone abandoning him. Leonard tells him that they are just across the hall. "Talk to the hand" replies Sheldon to Penny who says that people don't say that now or in 2003.

Raj plays the song for Emily who thinks that it is cute, but that she likes music that people can dance to. Raj tries to dance to it and then tells Howard the problem. Howard insists that their group does songs that make people think. Finally Howard realized that Raj played it for Emily and he was asking her comments. Howard accuses her of breaking up the band, quits himself and orders Raj out of his house. Raj storms out, but they quickly reunite.

Leonard and Penny have brought over dinner with Penny telling him that it seems like a big change, but it isn't. Sheldon disagrees and says that Amy is gone and soon they will be. They'll buy a house and instead of getting together a couple times a week, they will get together a couple times a month, and mainly for special occasions "Like when Howard and Bernadette divorce, or when Raj's creepy girlfriend finally tells where she hid his body or at Amy's wedding when she is marrying someone better than me."

After that Penny feels bad and then agrees that they won't change things that much and they will stay at his place. At least half the time, adds Sheldon to which Penny agrees to Leonard's confusion. Sheldon is going to be like their dog which is fine with Sheldon who runs off to create a revised roommate agreement.

The gang (except Amy) is at the comic book store listening to Howard and Raj. Everybody is polite and acting like they are enjoying the music. When the song ends, Stuart asks if they could play something that they could dance to.

Title reference: Sheldon resets his life and his apartment back to 2003 when he was happier and unemotional before he met Leonard.