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
11 Seasons, 232 Episodes
September 24, 2007
Cast: Johnny Galecki, Jim Parsons, Kaley Cuoco, Simon Helberg
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The Big Bang Theory Full Episode Guide

  • Amy gives Sheldon an answer to his proposal while Howard and Bernadette struggle with some unexpected news.

  • 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.

The Big Bang Theory News

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Check out these big 'Big Bang' secrets.

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Will the 'Big Bang' star sign on to the revival of the series that gave him his start?

'Big Bang Theory' Spin Off Casts Key Role

Annie Potts will play one of the series' most important roles.

Melissa Rauch Is Pregnant

The 'Big Bang' star also opens up about having had a miscarriage.

Mayim Bialik Has a New Kitten

The 'Big Bang' starred cuddled with her new friend over the weekend.

Mayim Bialik Can't Speak for a Month

The 'Big Bang' star is resting after straining her vocal cords.

Johnny Galecki's Home Destroyed in California Wildfire

The 'Big Bang' actor's home near San Luis Obispo was lost, according to a spokesperson.

'Big Bang' Star Posts Pic with Love of His Life

Kunal Nayyar shared an intimate moment with his best friend on Instagram.

Mayim Bialik Disputes Account of 'Big Bang' Salary Negotiations

The actress implies that her co-stars didn't take a pay cut so she could get a raise.

'Big Bang Theory' Star Marries Long-Time Partner

Jim Parsons and Todd Spiewak got married this weekend in New York.

Mayim Bialik Doesn't Feel Empowered by Nudity

The 'Big Bang' stars wants the right not to show off her body.

Jim Parsons Gives Preview of 'Big Bang' Spin Off

"It's like an origin story," he says.

'Big Bang Theory' Actors Get a Big Raise

Mayim Bialik and Melissa Rauch will be earning a lot more next year.

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The Big Bang Theory Video Clips & Extras

The Proposal Proposal (Sneak Peek) Clip (01:17) The Big Bang Theory Cast Opens Up About The Season 11 Premiere Clip (01:46) The Proposal Proposal (Preview) Clip (00:31) The Big Bang Theory Stars Reflect On 10 Years Of Love And Laughs Clip (03:18) Watch The Full Big Bang Theory Panel From San Diego Comic-Con 2017 Clip (47:31)