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An experiment designed to make participants fall in love piques Penny and Sheldon's interest, so they decide to put it to the test. Meanwhile, Leonard, Amy, Raj and Emily have an encounter with a "zombie" and Howard and Bernadette run into trouble at the a (more…)
There's trouble in paradise when Amy discovers Sheldon signed up for a one-way mission to colonize Mars, and the two get into a dogfight at a pet store. Meanwhile, Leonard makes a very "adult" purchase for Penny; and Emily catches Raj snooping in her apart (more…)
A speaking engagement at UC Berkeley puts Leonard and Sheldon in a galaxy not too far, far away from their idol George Lucas' Skywalker Ranch, and they consider dropping by. Meanwhile, Howard and Bernadette argue over what to do with his Doctor Who TARDIS (more…)
Howard discovers he has a half-brother; Sheldon and Amy build a blanket fort in the apartment and intend to have a platonic sleepover; and Leonard gets a surprise when he learns Penny's been invited to audition for a Kevin Smith movie.
In the event of alien contact, NASA asks Raj to craft a message for the extraterrestrials, and the guys battle over how it should be handled. Meanwhile, Penny must decide between auditioning for a film role or keeping her job in pharmaceutical sales.
Leonard and Sheldon's mothers come to town to celebrate their sons getting an award, but the opinionated women engage in an altercation over religion, while Bernadette wants husband Howard and housemate Stuart to do a bit more work around their new home.
To ease Penny's mind, Leonard pays a visit to the woman he kissed during his expedition to the North Sea, while Sheldon's breakup with Amy leads him to retaliate by shooting a special episode of "Fun With Flags." Later, Bernadette is wracked with guilt ove (more…)
The guys surprise Leonard with a belated bachelor-party weekend in Mexico, but their plans hit a bump in the road when they get a flat tire on the way. Meanwhile, the girls lean on Penny to tell her unsuspecting family that she and Leonard eloped.
When Barry Kripke gives the guys fencing lessons, he makes a point of letting Sheldon know he's interested in dating Amy. Also, Stuart has trouble getting female customers at the Comic Book Store, so Penny, Amy and Bernadette stop by to help out.
A helium shortage leads Sheldon and Leonard to do business with a dealer in the black market in order to acquire some of the element for an experiment they need to complete. Meanwhile, Penny and Bernadette download a dating app on Amy's phone in hopes that (more…)
When Leonard, Penny and Bernadette learn that Amy is going out on a dinner date, the trio set out to spy on her and the guy. Meanwhile, Sheldon recruits Raj and Howard to find a woman for him, since they were responsible for getting Amy and him together.
Now just friends, Sheldon and Amy spend Thanksgiving at the aquarium; a reluctant Wolowitz volunteers at a soup kitchen with Bernadette, Raj and Emily; and Penny realizes that Leonard knows a bit more about her than he's let on.
God only knows what song is constantly playing in Sheldon's head, but it reminds him of Amy and leads to a surprising revelation. Meanwhile, she is back in the dating game; and Raj and Howard go on a quest to find the only fan of their band, Footprints on (more…)
Prof. Proton visits Sheldon in a dream and gives him Obi-Wan Kenobi-like advice about whether to go see the new "Star Wars" film or spend the time with newly reunited girlfriend Amy on her birthday. Meanwhile, Leonard, Howard and Raj try to decide who will (more…)
Penny entices Leonard to meet with a psychiatrist and the results are surprising; Stuart moves out of the Wolowitz house and Howard and Bernadette find themselves at a loss. Also, in a once-in-a-blue-moon occasion, Sheldon teams with Raj on an astronomical (more…)
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- Premiered: September 24, 2007
- Rating: TV-PG
- Premise: Two nerdy physicists share an apartment and an unlikely friendship with their beautiful neighbor with whom one of them is infatuated. Like the universe after the big bang, the show's popularity expanded, thanks to breakout star Jim Parsons, along with the… (more)
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