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The Pilot is the first episode of the first season of the American sitcom The Big Bang Theory. This episode first aired on Monday, September 24, 2007.

In this episode, Sheldon and Leonard meet their new neighbor Penny who Leonard suddenly falls for, and is tasked to get her TV from her arrogant ex-boyfriend's apartment.


Leonard and Sheldon go to a "High I.Q. sperm bank to make donations and earn some money. To get the attention of the receptionist (Althea),

Leonard very quickly solves all her crossword puzzles for her, which does not please her. She has them fill out their forms, but they back out after Sheldon informs Leonard that "there is no guarantee that our sperm is going to generate high I.Q. offspring", ergo, they are committing genetic fraud. (This scene is not usually aired on reruns.) Upon returning to their apartment, they climb the stairs while Sheldon tells Leonard that if the stair steps are off by two millimeters most people will trip. Doing his experiment he tripped his father. At the top of the stairs, they spot Penny, who is moving into the apartment across the hall from them. Leonard and Sheldon agree that she is an improvement over their old neighbor, Louie/Louise, who, according to Sheldon, was a 200-pound transvestit with a skin condition. After Penny spots them, they exchange two rounds of "hi". Penny learns that they are her neighbors from across the hall. She offers to have coffee with them later.

Back home, Leonard thinks they should invite her over for lunch though Sheldon tells him that except for Howard and Raj, people don't come over. Penny is invited over to their apartment after a round-about invitation that includes mentioning the health of one's colon.

Penny enters their home and looking over Sheldon's whiteboard, she is impressed by their work. It includes some quantum mechanics, a little string theory doodling around the edges and a joke on the Bourn-Oppenheimer approximation. Sheldon agrees on Penny's suggestion that he is one of those Beautiful Mind genius guys. Leonard also shows her his whiteboard which Sheldon says should not impress her. Penny is introduced to Sheldon's obsessiveness when she accidentally sits in Sheldon's spot on the couch. Sheldon gives his first rendition of how that spot is perfect based upon the temperature, air currents and television visibility. She is also told that they like to play their game of Klingon Boggle.

Penny begins her story that she is a Sagittarius that tells them a lot about her. Sheldon concludes that she participate in the mass cultural delusion that the sun’s apparent position relative to arbitrarily defined constellations and the time of your birth somehow affects your personality. She is a vegetarian except for an occasional steak, which she loves, is from Nebraska, worked at the Cheesecake Factory, and is writing a screenplay about a sensitive girl who moves from Nebraska to be an actress. She also fell in love with a jerk that she has been living with for four years. Even though he lied and cheated, she still loves him and breaks into tears which the guys don't know what to do about. Leonard describes her dilemma as a paradox based upon a physics understanding of light as a wave or a particle. Penny doesn't really understand, but then she mentions that she feels so dirty and gross and her shower doesn't work. Leonard offer her to use their shower.

As she is taking a shower, Howard and Rajesh arrive with a video of Stephen Hawking from 1973, which excites them because it was before the time that he uses a computerized voice simulator. Howard says that phrase while doing his famous Stephen Hawking impersonation. Penny exits the shower only wearing a towel because she can't get the water to go from tub to shower, and she is introduced to them. Howard, thinking he is a professional ladies' man, hits on Penny while Raj is rendered silent since he can't speak in front of women due to his selective-mutism selective mutism, which was unknown at the time.

Leonard returns with her to the bathroom and gets the shower to work. She then steps into the shower and throws the towel over the curtain to an amazed Leonard. Penny then asks Leonard a favor, asking him to pick up her television from her ex-boyfriend, Kurt who lives across town. Due to his crush on Penny, Leonard agrees and drags Sheldon along. During their ride to Kurt's apartment, we discover that Leonard's last girlfriend was a North Korean spy named Joyce Kim.

Upon their arrival, they are denied access to the building, but by observing two clever girl scout types get into the building, they quickly slip in behind them. Penny's ex-boyfriend, who turns out to be a tall and very muscular man, refuses to give up the TV, and apparently finds Leonard and Sheldon so irritating that for that he robs them of their pants.

They return to their apartment, pants-less and TV-less. Penny feels sorry for Leonard and Sheldon after their incident and decides to make it up to them by paying for their dinner (along with Howard and Raj). While looking at Penny's apartment Sheldon tells Leonard that this thing with Penny isn't over. Leonard tells him that their children will be both smart and beautiful, to which Sheldon adds, "Not to mention imaginary."

In the car, the episode ends with Sheldon telling Leonard that despite the low chances of him starting a relationship with Penny, in comparison to the other males in the car; he is a "veritable Mac Daddy".


  • This is the only episode to not have a title reference.
  • This episode along with the Unaired Pilot are filmed in 35mm print, where "The Big Bran Hypothesis" onward, it was filmed digitally.
  • This is the first time Howard did a Stephen Hawking voice synthesizer impersonation.

External links

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Main Characters: Leonard HofstadterSheldon CooperPenny HofstadterHoward WolowitzRajesh KoothrappaliAmy Farrah FowlerBernadette Rostenkowski-WolowitzStuart BloomEmily SweeneyLeslie Winkle

Recurring Characters: Barry KripkeWil WheatonAltheaKurtEric GablehauserMary CooperDebbie WolowitzV.M. KoothrappaliMrs. KoothrappaliMikeStephanie BarnettBeverley HofstadterPresident SiebertZack JohnsonPriya KoothrappaliWyattMike RostenkowskiMrs. RostenkowskiAlex JensenJanine DavisLucyProfessor ProtonDavid GibbsClaireStephen HawkingAlfred HofstadterColonel Richard WilliamsDenise
Minor Characters: ChristyLalita GuptaToby LoobenfeldDennis KimDimitriMissy CooperBlainTomOctaviaMariaLourdesRamona NowitzkiKathy O'BrianDavid UnderhillAliciaMikaylaCaptain SweatpantsLonely LarryDr. CrawleyBethanySarahSkeeterProfessor LaughlinAbbyMarthaOfficer HackettSandyGlenVenkatesh KoothrappaliSebastianLouie/LouiseJoyce KimMrs. GundersonJoyMrs. FowlerAngela PageProfessor GlennMrs. LathamTodd ZarneckiSusanRandallColonel Richard Williams

Season 1: PilotThe Big Bran HypothesisThe Fuzzy Boots CorollaryThe Luminous Fish EffectThe Hamburger PostulateThe Middle-Earth ParadigmThe Dumpling ParadoxThe Grasshopper ExperimentThe Cooper-Hofstadter PolarizationThe Loobenfeld DecayThe Pancake Batter AnomalyThe Jerusalem DualityThe Bat Jar ConjectureThe Nerdvana AnnihilationThe Porkchop IndeterminacyThe Peanut ReactionThe Tangerine Factor

Season 2: The Bad Fish ParadigmThe Codpiece TopologyThe Barbarian SublimationThe Griffin EquivalencyThe Euclid AlternativeThe Cooper-Nowitzki TheoremThe Panty Piñata PolarizationThe Lizard-Spock ExpansionThe White Asparagus TriangulationThe Vartabedian ConundrumThe Bath Item Gift HypothesisThe Killer Robot InstabilityThe Friendship AlgorithmThe Financial PermeabilityThe Maternal CapacitanceThe Cushion SaturationThe Terminator DecouplingThe Work Song NanoclusterThe Dead Hooker JuxtapositionThe Hofstadter IsotopeThe Vegas RenormalizationThe Classified Materials TurbulenceThe Monopolar Expedition
Season 3: The Electric Can Opener FluctuationThe Jiminy ConjectureThe Gothowitz DeviationThe Pirate SolutionThe Creepy Candy Coating CorollaryThe Cornhusker VortexThe Guitarist AmplificationThe Adhesive Duck DeficiencyThe Vengeance FormulationThe Gorilla ExperimentThe Maternal CongruenceThe Psychic VortexThe Bozeman ReactionThe Einstein ApproximationThe Large Hadron CollisionThe Excelsior AcquisitionThe Precious FragmentationThe Pants AlternativeThe Wheaton RecurrenceThe Spaghetti CatalystThe Plimpton StimulationThe Staircase ImplementationThe Lunar Excitation
Season 4: The Robotic ManipulationThe Cruciferous Vegetable AmplificationThe Zazzy SubstitutionThe Hot Troll DeviationThe Desperation EmanationThe Irish Pub FormulationThe Apology InsufficiencyThe 21-Second ExcitationThe Boyfriend ComplexityThe Alien Parasite HypothesisThe Justice League RecombinationThe Bus Pants UtilizationThe Love Car DisplacementThe Thespian CatalystThe Benefactor FactorThe Cohabitation FormulationThe Toast DerivationThe Prestidigitation ApproximationThe Zarnecki IncursionThe Herb Garden GerminationThe Agreement DissectionThe Wildebeest ImplementationThe Engagement ReactionThe Roommate Transmogrification
Season 5: The Skank Reflex AnalysisThe Infestation HypothesisThe Pulled Groin ExtrapolationThe Wiggly Finger CatalystThe Russian Rocket ReactionThe Rhinitis RevelationThe Good Guy FluctuationThe Isolation PermutationThe Ornithophobia DiffusionThe Flaming Spittoon AcquisitionThe Speckerman RecurrenceThe Shiny Trinket ManeuverThe Recombination HypothesisThe Beta Test InitiationThe Friendship ContractionThe Vacation SolutionThe Rothman DisintegrationThe Werewolf TransformationThe Weekend VortexThe Transporter MalfunctionThe Hawking ExcitationThe Stag ConvergenceThe Launch AccelerationThe Countdown Reflection
Season 6: The Date Night VariableThe Decoupling FluctuationThe Higgs Boson ObservationThe Re-Entry MinimizationThe Holographic ExcitationThe Extract ObliterationThe Habitation ConfigurationThe 43 PeculiarityThe Parking Lot EscalationThe Fish Guts DisplacementThe Santa SimulationThe Egg Salad EquivalencyThe Bakersfield ExpeditionThe Cooper/Kripke InversionThe Spoiler Alert SegmentationThe Tangible Affection ProofThe Monster IsolationThe Contractual Obligation ImplementationThe Closet ReconfigurationThe Tenure TurbulenceThe Closure AlternativeThe Proton ResurgenceThe Love Spell PotentialThe Bon Voyage Reaction
Season 7: The Hofstadter InsufficiencyThe Deception VerificationThe Scavenger VortexThe Raiders MinimizationThe Workplace ProximityThe Romance ResonanceThe Proton DisplacementThe Itchy Brain SimulationThe Thanksgiving DecouplingThe Discovery DissipationThe Cooper ExtractionThe Hesitation RamificationThe Occupation RecalibrationThe Convention ConundrumThe Locomotive ManipulationThe Table PolarizationThe Friendship TurbulenceThe Mommy ObservationThe Indecision AmalgamationThe Relationship DiremptionThe Anything Can Happen RecurrenceThe Proton TransmogrificationThe Gorilla DissolutionThe Status Quo Combustion
Season 8: The Locomotion InterruptionThe Junior Professor SolutionThe First Pitch InsufficiencyThe Hook-up ReverberationThe Focus AttenuationThe Expedition ApproximationThe Misinterpretation AgitationThe Prom EquivalencyThe Septum DeviationThe Champagne ReflectionThe Clean Room InfiltrationThe Space Probe DisintegrationThe Anxiety OptimizationThe Troll ManifestationThe Comic Book Store RegenerationThe Intimacy AccelerationThe Colonization ApplicationThe Leftover ThermalizationThe Skywalker IncursionThe Fortification ImplementationThe Communication DeteriorationThe Graduation TransmissionThe Maternal CombustionThe Commitment Determination
Season 9: The Matrimony MomentumThe Separation OscillationThe Bachelor Party CorrosionThe 2003 ApproximationThe Perspiration ImplementationThe Helium InsufficiencyThe Spock ResonanceThe Mystery Date ObservationThe Platonic PermutationThe Earworm ReverberationThe Opening Night ExcitationThe Sales Call SublimationThe Empathy OptimizationThe Meemaw MaterializationThe Valentino SubmergenceThe Positive Negative ReactionThe Celebration ExperimentationThe Application DeteriorationThe Solder Excursion DiversionThe Big Bear PrecipitationThe Viewing Party CombustionThe Fermentation BifurcationThe Line Substitution SolutionThe Convergence-Convergence
Season 10: The Conjugal ConjectureThe Military MiniaturizationThe Dependence TranscendenceThe Cohabitation ExperimentationThe Hot Tub ContaminationThe Fetal Kick CatalystThe Veracity ElasticityThe Brain Bowl IncubationThe Geology ElevationThe Property Division CollisionThe Birthday SynchronicityThe Holiday SummationThe Romance RecalibrationThe Emotion Detection AutomationThe Locomotion ReverberationThe Allowance EvaporationThe Comic-Con ConundrumThe Escape Hatch IdentificationThe Collaboration FluctuationThe Recollection DissipationThe Separation AgitationThe Cognition RegenerationThe Gyroscopic CollapseThe Long Distance Dissonance
Season 11: The Proposal ProposalThe Retraction ReactionThe Relaxation IntegrationThe Explosion ImplosionThe Collaboration ContaminationThe Proton RegenerationThe Geology MethodologyThe Tesla RecoilThe Bitcoin EntanglementThe Confidence ErosionThe Celebration ReverberationThe Matrimonial MetricThe Solo OscillationThe Separation TriangulationThe Novelization CorrelationThe Neonatal NomenclatureThe Athenaeum AllocationThe Gates ExcitationThe Tenant DisassociationThe Reclusive PotentialThe Comet PolarizationThe Monetary InsufficiencyThe Sibling RealignmentThe Bow Tie Asymmetry
Season 12: The Conjugal ConfigurationThe Wedding Gift WormholeThe Procreation CalculationThe Tam TurbulenceThe Planetarium CollisionThe Imitation PerturbationThe Grant Allocation DerivationThe Consummation DeviationThe Citation NegationThe VCR IlluminationThe Paintball ScatteringThe Propagation PropositionThe Confirmation PolarizationThe Meteorite ManifestationThe Donation OscillationThe D & D VortexThe Conference ValuationThe Laureate AccumulationThe Inspiration DeprivationThe Decision ReverberationThe Plagiarism SchismThe Maternal ConclusionThe Change ConstantThe Stockholm Syndrome

The Apartment BuildingApartment 4AApartment 4BThe ElevatorCalifornia Institute of TechnologyWolowitz HouseThe Comic Center of PasadenaPasadenaThe Cheesecake FactoryRaj's ApartmentAmy's ApartmentHoward and Bernadette's ApartmentThe StairsSheldon's Old OfficeRaj's Old OfficeSheldon's New OfficeHoward's LabThe University CafeteriaKripke's Plasma LabInternational Space StationThe Kinetics Lab
See Also
Unaired Pilot