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The first season of the American sitcom The Big Bang Theory was originally aired on CBS from September 24, 2007, to May 19, 2008, over 17 episodes.

Cast

Main cast

Recurring cast

Guest cast

Episode (Season/Ep#) Title Original Air Date Director Summary
101 Pilot September 24, 2007 James Burrows After an unsuccessful visit to the high-IQ sperm bank, Leonard and Sheldon return home to find out Penny, a new neighbor, has moved in across the hall. Leonard immediately becomes smitten in her.
102 The Big Bran Hypothesis October 1, 2007 Mark Cendrowski When Sheldon and Leonard go over to Penny's apartment to drop off a box of furniture that came for her, Sheldon is deeply disturbed when he sees how messy and disorganized her apartment appears. Later that night, while Penny sleeps, Sheldon sneaks into her apartment to clean and organize it, but Leonard catches him and reluctantly helps him.
103 The Fuzzy Boots Corollary October 8, 2007 Mark Cendrowski When Leonard sees Penny kissing a guy in front of her apartment door, he is devastated thinking she has "rejected" him. The guys convince him to ask someone out at work, so he asks out fellow scientist Leslie Winkle, who preemptively turns him down. Leonard then asks Penny out, while Penny thinks that she is having dinner with the gang.
104 The Luminous Fish Effect October 15, 2007 Bob Koherr Sheldon gets dismissed from his job as a physicist at the university when he insults his new boss Eric Gablehauser during their first meet. His change of circumstance sends him into a downward spiral of depression which Leonard tries to cure by sending for Sheldon's mom, Mary Cooper.
105 The Hamburger Postulate October 22, 2007 Andrew D. Weyman While eating at The Cheesecake Factory where Penny works, the guys run into Leslie Winkle and she suggests that Leonard play in her string quartet as they are in need of a new cellist. Later, after the practice in Leonard and Sheldon's apartment, Leslie offers herself to Leonard and they have sex.
106 The Middle Earth Paradigm October 29, 2007 Mark Cendrowski The guys are invited to Penny's Halloween party, first turning it down as they don't dance but changing their mind when costumes are mentioned. Later, Penny's ex-boyfriend Kurt shows up.
107 The Dumpling Paradox November 5, 2007 Mark Cendrowski Penny's promiscuous friend Christy from Nebraska is in town, and ends up being seduced by Howard. The pair takes over Penny's apartment, causing her to sleep on Leonard and Sheldon's couch for the night.
108 The Grasshopper Experiment November 12, 2007 Ted Wass Raj's parents set him up on a date and he fears he won’t be able to talk to her. Penny needs to practice her bar tending skills for work and once Raj drinks, he can finally talk to her. On the date with Lalita Gupta, he is an obnoxious drunk and she is all too happy to leave with Sheldon when he starts to flatter her.
109 The Cooper-Hofstadter Polarization March 17, 2008 Joel Murray Cleaning up after an internet experiment, Leonard discovers a letter in the trash can. He and Sheldon had been invited to present some research they had done together at a physics conference. However Sheldon does not believe in such things and says if he won't go, no one can. Leonard defies him and says he will go and present the findings on his own.
110 The Loobenfeld Decay March 24, 2008 Mark Cendrowski Leonard hears Penny singing, which is off-key. When she asks him to come to a showcase he lies and says that he and Sheldon have plans. Sheldon is uncomfortable with the lie which Leonard gives and so comes up with a new one which takes on a life of it's own.
111 The Pancake Batter Anomaly March 31, 2008 Mark Cendrowski When Sheldon becomes ill, Leonard runs away. Howard]] and Raj join him in hiding because of how needy Sheldon becomes. Penny ends up having to look after him.
112 The Jerusalem Duality April 14, 2008 Mark Cendrowski Dennis Kim, a child genius is looking around the university and seems to have outstripped Sheldon in every way. Sheldon decides to give up his own work and focus on other tasks. These annoy the guys so much that they try to distract Dennis.
113 The Bat Jar Conjecture April 21, 2008 Mark Cendrowski It’s the annual Physics Bowl and the usual competition isn't going to be competing (they got a gig as a barbershop quartet playing Knotts Berry Farm), so the four guys form a team, but end up booting Sheldon off their team because he is showboating. They recruit Leslie Winkle, Sheldon's nemisis.
114 The Nerdvana Annihilation April 28, 2008 Mark Cendrowski Leonard accidentally buys a full size prop of the time machine from the movie The Time Machine. As the guys attempt to bring it up to their apartment they block the stairs and Penny ends up missing work. After she lashes out at Leonard for having all these toys, Leonard tries to get rid of them.
115 The Porkchop Indeterminacy May 5, 2008 Mark Cendrowski The guys see an attractive woman in Sheldon's office and can not believe their eyes. The woman turns out to be his twin sister Missy Cooper, who was in town for a wedding and needed Sheldon to sign some papers for her father's estate. The boys are smitten with her and Leonard insists she stay with them. The boys squabble over whilst instantly try to hit on her, causing Missy to take refuge at Penny's place.
116 The Peanut Reaction May 12, 2008 Mark Cendrowski When Penny finds out that Leonard has never had a birthday party she decides to throw him a surprise one despite Sheldon's objections and is later blackmailed into helping her.
117 The Tangerine Factor May 19, 2008 Mark Cendrowski After another messy break up Penny asks Leonard why she can’t go out with a nice honest guy. So he asks her out. She says yes, but they both feel nervous about it and go to Sheldon for advice.


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Media
The Big Bang TheoryYoung SheldonVideo
Characters
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 HawkingColonel 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 ZarneckiColonel Richard Williams

Episodes
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

Locations
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
Songs
Transportations
See Also
Unaired Pilot
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