Watch The Big Bang Theory

Leonard, Sheldon, Raj, and Howard aren't your average Pasadena post-grads. They are, each in his own right, geniuses, which makes for an interesting storm of nerdy antics and comical conundrums. Socially awkward, romantically-challenged, and professionally driven, the four stars play out more like brainy boys.

Thursday 8:00 pm et/pt on CBS
10 Seasons, 231 Episodes
September 24, 2007
Cast: Jim Parsons, Sheldon Cooper, Johnny Galecki, Leonard Hofstadter, Kaley Cuoco
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The Big Bang Theory Full Episode Guide

  • The gang is concerned when Sheldon's former admirer, Dr. Ramona Nowitzki, resurfaces while Amy is away at Princeton.

  • After Leonard, Sheldon and Wolowitz celebrate the completion of the top secret air force project, they are met with an unpleasant surprise. Also, Amy is offered a summer position as a visiting researcher.

  • Leonard is upset when Penny considers taking a new job offered by her ex-boyfriend, Zack.

  • Howard and Bernadette struggle leaving Halley in day care when Bernadette's maternity leave is up. Also, Bert introduces the gang to his new girlfriend, Rebecca.

  • Sheldon spreads himself too thin when he works on projects with Leonard and Wolowitz as well as Amy on the same day. Also, Bernadette is nearing the end of her maternity leave and must return to work.

  • Leonard, Penny and Raj adjust to their new living situation and Sheldon becomes intrigued by Amy's work.

  • When the gang offers a place for Raj to live, it creates unexpected conflict among everyone and an argument between Amy and Leonard's mother.

  • Sheldon and Amy have their first fight since moving in together and Koothrappali is stunned by what financial independence really means when he stops receiving support from his father.

  • Leonard and Wolowitz try to distract Sheldon when he slows the progress of their guidance system. Also, Penny and Amy take Bernadette out for the night, leaving Raj and Stuart to care for baby Halley.

  • Sheldon uses a machine to help him identify other people's emotions, and Raj tries to make sense of why he struggles with women.

  • Sheldon gets involved when Leonard and Penny get into an argument. Meanwhile, Howard and Raj are determined to fix a squeaky floorboard in the baby's room.

  • Sheldon and Amy see Leonard and Penny for the first time since the holidays and share the details of their trip to Texas.

  • Amy's birthday wish is to have an intimate night with Sheldon, but things are interrupted when Bernadette goes into labor.

  • Sheldon and Leonard must separate their stuff and remove Penny's things from 4B.

  • Sheldon is green with envy when Bert, a Caltech geologist, wins the MacArthur Genius fellowship. Also, Wolowitz finds an old remote control Stephen Hawking action figure he invented.

  • Following a successful experiment combining their genes, Sheldon is determined to convince Amy they should procreate. Also, Koothrappali is ashamed to tell the gang the occupation of his new girl.

  • Amy lies to Sheldon so she can still live with him. Later, they host an "on location" episode of "Fun With Flags" in Penny‚Äôs apartment.

  • Penny is pleasantly surprised when she discovers she has fans of her performance in "Serial Ape-ist." Also, Amy hosts a Sheldon-style brunch at Penny's apartment, and Wolowitz gets spontaneous.

  • When Amy's apartment floods, she proposes a "cohabitation experiment" with Sheldon. Also, Howard and Bernadette are upset when Koothrappali learns the gender of the baby before they do.

  • Sheldon can't keep up with the late nights Howard and Leonard are putting in, Raj spends the day with a pregnant Bernadette and Penny and Amy attend a faculty party.

  • The Air Force shows interest in the guidance system and Penny lets it slip at work that Bernadette is expecting.

  • A night of revelry and bad decisions on behalf of the guys' parents results in an awkward morning. Penny's dysfunctional family is in town as well; chaos ensues.

  • Leonard and Penny get remarried in front of their friends. Meanwhile, chaos erupts when Leonard's parents and Sheldon's mother make a connection. Howard gets a cryptic email from the Air Force about his invention.

  • Sheldon hires Stuart to spend the day with Amy so he can attend a movie screening. Meanwhile, Leonard's mother visits and Penny struggles to make a connection with her.

  • Sheldon and Bernadette skip out when the group goes wine tasting.

  • A Game of Thrones viewing party takes an unexpected turn.

  • Sheldon, Amy, Leonard and Penny head to Big Bear for a getaway together. Meanwhile Raj intervenes in Bernadette and Howard's baby discussion.

  • Amy gets Sheldon a new laptop, but is shocked by his reaction. Koothrappali tattles on Leonard and Wolowitz after they lie to their wives in order to attend an early screening of a movie.

  • Sheldon draws up a contract that explains how they will divide their portion of their guidance system invention royalties, but Bernadette doesn't agree with it. Raj must again decide between Emily and Claire when they both contact him.

  • The gang finally celebrates Sheldon's birthday after nine years of friendship and gives him the surprise of his life.

  • Bernadette is surprised by Howard's reaction to news he's going to be a father. How will everyone else react?

  • Sheldon and Amy host a live Valentine's Day episode of Fun with Flags, Leonard and Penny struggle with aging, Howard and Bernadette find a surprise in their hot tub and Raj is torn between his feelings for Emily and the cute girl he met at the Comic Bookstore.

  • Sheldon is excited when his Meemaw comes to visit, but things quickly go south when she clashes with Amy. Also, Raj meets a new girl at the comic book store who makes him doubt his relationship with Emily.

  • Leonard, Penny and the gang decide to treat themselves to a Sheldon-free weekend after dealing with him when he's sick.

  • Leonard sees a psychiatrist for Penny. Also, Sheldon and Koothrappali collaborate on an astronomical discovery.

  • Sheldon and Amy have been together for half a decade and finally spend their first night together. Also, Leonard, Wolowitz, and Koothrappali must decide who will take their extra Star Wars movie ticket.

  • No one knows the song that is constantly playing in Sheldon's head, but it reminds him of Amy and he has an epiphany. Meanwhile, Amy reenters the dating game.

  • Sheldon and Amy hang out as friends on Thanksgiving at the aquarium. Meanwhile, Wolowitz is hesitant to volunteer at the soup kitchen with Bernadette.

  • Leonard, Penny and Bernadette spy on Amy, who has a date. Sheldon leaves it up to Howard and Raj to help him find a new girlfriend since they found Amy for him.

  • During an interview for a documentary about Spock from "Star Trek," Sheldon struggles to keep his emotions in check in the wake of his recent break-up with Amy.

  • In the middle of a national helium shortage, Sheldon and Leonard act aggressively to find the supplies they need. In addition, Penny and Bernadette search for a new boyfriend for Amy by downloading a dating app on her phone.

  • The boys take a fencing class from Barry Kripke and Sheldon gets uncomfortable when Kripke shows interest in Amy. Penny, Amy, and Bernadette stop by the Comic Book Store to help Stuart gain girl customers.

  • Sheldon chooses to revert to the year 2003 after he hears about an alteration in his living situation. Meanwhile, Howard and Raj put together a band to perform at the Comic Book Store.

  • The guys try to go on a surprise belated bachelor-party for Leonard to Mexico. The girls rely on Penny to let her family know about her and Leonard eloping.

  • Leonard talks to the girl he kissed on the North Sea in order to comfort Penny. Meanwhile, Sheldon shoots an episode of "Fun with Flags" after he splits up with Amy, and keeping a secret from Penny makes Bernadette feel guilty.

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