[[caption-width-right:350:Yes, this is a picture from a show named after the event that created the universe.[[note]]Left to right: [[CuteButCacophonic Bernadette]], [[CasanovaWannabe Howard]], [[LovableNerd Leonard]], [[GirlNextDoor Penny]], [[InsufferableGenius Sheldon]], [[BrainyBrunette Amy]], [[FunnyForeigner Raj]].[[/note]]]]

->'''Leonard:''' Okay, well, I'm an experimental physicist at Caltech. Most of my research involves high powered lasers. Oh, and I just got a government grant to see if they can be used to knock out incoming ballistic missiles.\\
'''Penny:''' Wow! Can they?\\
'''Leonard:''' Oh God no! ([[{{Beat}} long pause]]) But [[OnlyInItForTheMoney the money's good]]... and I used the equipment to build my own BatSignal.

''The Big Bang Theory'' is a Creator/{{CBS}} {{sitcom}}, created by Creator/ChuckLorre, which made its debut in 2007, featuring four [[TVGenius genius-level]] friends (with careers ranging from theoretical physics to engineering) and [[GirlNextDoor a pretty girl]] who shakes up their dependence on UsefulNotes/TheScientificMethod and geeky lifestyle.

The main characters are two OddCouple roommates, Dr. Leonard Hofstadter[[note]](Johnny Galecki)[[/note]] and Dr. Sheldon Cooper[[note]](Creator/JimParsons)[[/note]]. Leonard is a mild-mannered {{nerd}} who, although awkward, is still socially capable. Sheldon is an [[InsufferableGenius egomaniacal supergenius]] who displays signs of [[SuperOCD OCD]], [[DistractedByTheShiny ADHD]] and many other {{Ambiguous Disorder}}s.

A cute new neighbor named Penny[[note]](Creator/KaleyCuoco)[[/note]] moves in next door, and Leonard almost instantly develops a crush on her. Penny is actually a perfectly normal person with an average intelligence level, but compared to Leonard and [[SitcomArchNemesis Sheldon]] comes across as a DumbBlonde. On the other hand, she is very friendly and outgoing with a vibrant social life and a multitude of interests, [[{{Foil}} contrasting the shy, reclusive personalities of the guys]].

Rounding out the cast are two other genius geeks who are always visiting Sheldon and Leonard: Howard Wolowitz[[note]](Simon Helberg)[[/note]], a [[CasanovaWannabe wild but unsuccessful womanizer]] who never stops hitting on Penny; and Dr. Rajesh "Raj" Koothrappali[[note]](Kunal Nayyar)[[/note]], who suffers from [[ShrinkingViolet crippling mutism]] whenever women are around (unless he's drunk).

The fourth season added two new female characters in semi-regular roles, who would eventually be promoted to the main cast: Dr. Bernadette Rostenkowski[[note]](Creator/MelissaRauch)[[/note]], a sweet-hearted microbiologist who is introduced as Penny's friend and co-worker, and soon formed a relationship with Howard; and Dr. Amy Farrah Fowler[[note]](Creator/MayimBialik)[[/note]], a DistaffCounterpart to Sheldon who gradually became best friends with Penny and [[DivergentCharacterEvolution eased out of her neurotic shell]]. These two ended up forming a PowerTrio with Penny that contrasts the four guys and gives a new female perspective on the show.

The show's humor can be divided into several categories: [[GeniusBonus obscure references]] to physics or {{Geek}} culture, every {{nerd}} stereotype the writers can think of and the culture clash between Penny and the guys. Any given episode shuffles between romantic comedy/relationship drama, indulging in an established geeky pursuit and the work lives of the characters at [[http://en.wikipedia.org/wiki/Caltech Caltech]]. And, for the most part, the scientific and nerd references are ''[[ShownTheirWork accurate]]'', or at least close enough that somewhere between the writing and the acting someone knows what they're talking about. The writers consult Dr. David Salzberg of UCLA for advice on scripts, dialogue and he personally maps out [[TheBigBoard the white board equations]].

As for the show's [[RuleOfDrama drama]] and [[StoryArc overarching plot]], most of that relies on UnresolvedSexualTension between Leonard and Penny. The series almost runs on GiveGeeksAChance.

A transcript of episodes can be found [[http://bigbangtrans.wordpress.com/ here]].

Now has a [[Characters/TheBigBangTheory character sheet]].

As of the 2017-2018 season, CBS premiered [[Series/YoungSheldon a spinoff show]] featuring the younger Sheldon, narrated by Creator/JimParsons.

!!General Tropes:
* TheBigBangTheory/TropesAToE
* TheBigBangTheory/TropesFToJ
* TheBigBangTheory/TropesKToO
* TheBigBangTheory/TropesPToS
* TheBigBangTheory/TropesTToZ
!!Season Tropes
* TheBigBangTheory/SeasonOne
* TheBigBangTheory/SeasonTwo
* TheBigBangTheory/SeasonThree
* TheBigBangTheory/SeasonFour
* TheBigBangTheory/SeasonFive
* TheBigBangTheory/SeasonSix
* TheBigBangTheory/SeasonSeven
* TheBigBangTheory/SeasonEight
* TheBigBangTheory/SeasonNine
* TheBigBangTheory/SeasonTen
* TheBigBangTheory/SeasonEleven