Your Best Guide to The Big Bang Theory Journey

The Big Bang Theory is one of the most popular series out there – it has lots of Emmy nominations. It made us laugh for so many years – 12, to be exact. It is full of humor, and our favorite characters have managed to find their place in our hearts from the very beginning. It also got a spin-off, Young Sheldon.

The Big Bang Theory was developed by Chuck Lorre and Bill Prady. Here is all you need to know about the famous show. Its IMDB rating is 8.1/10. You can watch it on Netflix and Amazon Prime. As of now, there are 279 episodes available.

What about the cast?

• Penny – Kaley Cuoco
• Sheldon Cooper – Jim Parsons
• Leonard Hofstadter – Johnny Galecki
• Howard Wolowitz – Simon Helberg
• Raj Koothrappali – Kunal Nayyar
• Amy Farrah Fowler – Mayim Bialik
• Bernadette Rostenkowski-Wolowitz – Melissa Rauch

12 seasons – 279 episodes. Everything there is to know:

Season  1 – 17 episodes

• Summary

In the first episode, we meet Leonard and Sheldon, who live together, and whose world revolves around science and physics. They are both socially awkward and have a hard time socializing with everyone around them – especially girls.  So the luck is that a beautiful young woman – Penny – moves across the hall. Leonard is attracted to her, and when he gets his courage to finally ask her out, he learns that she’s already dating someone. Sheldon, Leonard’s best friend, has the habit of showing that he’s the better one, so he hurts the ego of his boss, and he gets fired. We also meet Raj, who is not able to speak to women – until he sees that he is, in fact, able to do so but only after a few drinks. At the end of the season, we see Penny and Sheldon going out on a date.

• Episodes

S1E1 – Pilot

S1E2 – The Big Bran Hypothesis

S1E3 – The Fuzzyboots Corollary

S1E4 – The Luminous Fish Effect

S1E5 – The Hamburger Postulate

S1E6 – The Middle Earth Paradigm

S1E7 – The Dumpling Paradox

S1E8 – The Grasshopper Experiment

S1E9 – The Cooper-Hofstadter Polarization

S1E10 – The Loobenfeld Decay

S1E11 – The Pancake Batter Anomaly

S1E12 – The Jerusalem Duality

S1E13 – The Bat Jar Conjecture

S1E14 – The Nerdvana Annihilation

S1E15 – The Pork Chop Indeterminacy

S1E16 – The Peanut Reaction

S1E17 – The Tangerine Factor

Season 2 – 23 episodes

• Summary

At the beginning of this season, we see Leonard and Penny encountering some troubles as they are both trying to meet someone else.l However, both of them feel jealous to see each other dating other people, and the fact that Sheldon’s friendship with Penny becomes even more stronger bothers Leonard even more. Howard, as we know him, is still a player, and he keeps dating a lot of girls until he enters a relationship with Leslie. However, their relationship is rather a stronger friendship and not a romantic relationship.

We get to see more of Sheldon’s obsessive nature, and Penny is trying to help him out. Raj does something unfortunate, and he has to apologize to Penny for the way he behaved. At the end of the season, we see how Penny shares her feelings to Leonard. We also get to meet the new character Barry Kripke.

• Episodes

S2E1 – The Bad Fish Paradigm

S2E2 – The Codpiece Topology

S2E3 – The Barbarian Sublimation

S2E4 – The Griffin Equivalency

S2E5 – The Euclid Alternative

S2E6 – The Cooper–Nowitzki Theorem

S2E7 – The Panty Piñata Polarization

S2E8 – The Lizard–Spock Expansion

S2E9 – The White Asparagus Triangulation

S2E10 – The Vartabedian Conundrum

S2E11 – The Bath Item Gift Hypothesis

S2E12 – The Killer Robot Instability

S2E13 – The Friendship Algorithm

S2E14 – The Financial Permeability

S2E15 – The Maternal Capacitance

S2E16 – The Cushion Saturation

S2E17 – The Terminator Decoupling

S2E18 – The Work Song Nanocluster

S2E19 – The Dead Hooker Juxtaposition

S2E20 – The Hofstadter Isotope

S2E21 – The Vegas Renormalization

S2E22 – The Classified Materials Turbulence

S2E23 – The Monopolar Expedition

Season 3 – 23 episodes

• Summary

Penny and Leonard finally get together for the very first time after he returned home from the research he conducted at the North Pole. At the same time, there’s a little bit of awkwardness between them. Sheldon is trying to help Raj to stay in India by asking him to work for him. The friendship between Penny and Sheldon grows a little bit more as they help each other to learn new things. For example, Sheldon teaches Penny about physics, and Penny teaches Sheldon about baking cookies. Sheldon is also the rational voice between Penny and Leonard. Sheldon teaches Leonard about football in order to impress Penny’s friends.

Barry Kripke becomes Sheldon’s enemy, and he wants to get revenge. At the same time, Bernadette gets invited to watch Leonard’s experiment as she shows an interest in physics, thing that makes Howard jealous. Penny asks Sheldon to teach her about physics in order to understand Leonard’s work.

We also get to see Leonard’s mother giving him a surprise visit, which seems to be a bother for her son and for Penny, but an excellent visit for Sheldon. We also see Will Wheaton appearing as being Sheldon’s enemy. Leonard says “I love you” to Penny, but he doesn’t get the response that he wanted to from her, so they broke up. In order not to upset his friend, Sheldon keeps a secret the fact that he had a friendly dinner with Penny after they broke up. Penny gets to a definite conclusion that she cannot date normal guys after dating Leonard, so she ends up sleeping with him again.

• Episodes

S3E1 – The Electric Can Opener Fluctuation

S3E2 – The Jiminy Conjecture

S3E3 – The Gothowitz Deviation

S3E4 – The Pirate Solution

S3E5 – The Creepy Candy Coating Corollary

S3E6 – The Cornhusker Vortex

S3E7 – The Guitarist Amplification

S3E8 – The Adhesive Duck Deficiency

S3E9 – The Vengeance Formulation

S3E10 – The Gorilla Experiment

S3E11 – The Maternal Congruence

S3E12 – The Psychic Vortex

S3E13 – The Bozeman Reaction

S3E14 – The Einstein Approximation

S3E15 – The Large Hadron Collision

S3E16 – The Excelsior Acquisition

S3E17 – The Precious Fragmentation

S3E18 – The Pants Alternative

S3E19 – The Wheaton Recurrence

S3E20 – The Spaghetti Catalyst

S3E21 – The Plimpton Stimulation

S3E22 – The Staircase Implementation

S3E23 – The Lunar Excitation

Season 4 – 24 episodes

• Summary

In this season, the main characters of the series try to find their right partners and start dating other people. Penny soon realizes that she has true feelings for Leonard after seeing what it’s like to date other men. Leonard starts dating Priya, Raj’s sister. Howard asks Bernadette to marry him, and Sheldon meets a new girl: Amy.

Penny is jealous of Priya. Leonard wants to break up with Priya after he finds out that she wants to move back to India. Penny and Amy become friends, and they talk about how much Penny regrets that she left Leonard. She says that she wants to get back with him.

• Episodes

S4E1 – The Robotic Manipulation

S4E2 – The Cruciferous Vegetable Amplification

S4E3 – The Zazzy Substitution

S4E4 – The Hot Troll Deviation

S4E5 – The Desperation Emanation

S4E6 – The Irish Pub Formulation

S4E7 – The Apology Insufficiency

S4E8 – The 21-Second Excitation

S4E9 – The Boyfriend Complexity

S4E10 – The Alien Parasite Hypothesis

S4E11 – The Justice League Recombination

S4E12 – The Bus Pants Utilization

S4E13 – The Love Car Displacement

S4E14 – The Thespian Catalyst

S4E15 – The Benefactor Factor

S4E16 – The Cohabitation Formulation

S4E17 – The Toast Derivation

S4E18 – The Prestidigitation Approximation

S4E19 – The Zarnecki Incursion

S4E20 – The Herb Garden Germination

S4E21 – The Agreement Dissection

S4E22 – The Wildebeest Implementation

S4E23 –  The Engagement Reaction

S4E24 – The Roommate Transmogrification

Season 5 – 24 episodes

• Summary

Season 5 brings us a new wedding: Bernadette and Howard. Sheldon is finally getting together with Amy – they’re girlfriend and boyfriend now. Penny regrets something she did while she was with Raj. In the meantime, Howard goes into Space for research. Leonard and Priya continue their long-distance relationship, and eventually, it comes to an end. Then, Leonard and Penny decide to get back together and give their future together one more try. 

• Episodes

S5E1 – The Skank Reflex Analysis

S5E2 – The Infestation Hypothesis

S5E3 – The Pulled Groin Extrapolation

S5E4 – The Wiggly Finger Catalyst

S5E5 – The Russian Rocket Reaction

S5E6 – The Rhinitis Revelation

S5E7 – The Good Guy Fluctuation

S5E8 – The Isolation Permutation

S5E9 – The Ornithophobia Diffusion

S5E10 – The Flaming Spittoon Acquisition

S5E11 – The Speckerman Recurrence

S5E12 – The Shiny Trinket Maneuver

S5E13 – The Recombination Hypothesis

S5E14 – The Beta Test Initiation

S5E15 – The Friendship Contraction

S5E16 – The Vacation Solution

S5E17 – The Rothman Disintegration

S5E18 – The Werewolf Transformation

S5E19 – The Weekend Vortex

S5E20 – The Transporter Malfunction

S5E21 – The Hawking Excitation

S5E22 – The Stag Convergence

S5E23 – The Launch Acceleration

S5E24 – The Countdown Reflection

Season 6 – 24 episodes

• Summary

After he gets married, Howard is trying to balance everything in his life: from his mother to what Bernadette wants. Penny and Leonard’s relationship grows even stronger. However, Penny is still not sure about what she feels for him. Amy and Sheldon also have a strong relationship. It keeps progressing, even if it’s slower than Amy would have wanted. Leonard is proposing to Penny.

Raj is attracted to a new girl called Lucy. She soon starts to hang out with the group of friends. Leonard has the chance to work with Stephen Hawking, but he refuses because he does not want to leave Penny alone for four months. However, Penny and Sheldon convince him to make the most out of this opportunity, and he leaves for the North Sea. Lucy breaks up with Raj, and he starts to talk to other girls without having drinks before.

• Episodes

S6E1 – The Date Night Variable

S6E2 – The Decoupling Fluctuation

S6E3 – The Higgs Boson Observation

S6E4 – The Re-Entry Minimization

S6E5 – The Holographic Excitation

S6E6 – The Extract Obliteration

S6E7 – The Habitation Configuration

S6E8 – The 43 Peculiarity

S6E9 – The Parking Spot Escalation

S6E10 – The Fish Guts Displacement

S6E11 – The Santa Simulation

S6E12 – The Egg Salad Equivalency

S6E13 – The Bakersfield Expedition

S6E14 – The Cooper/Kripke Inversion

S6E15 – The Spoiler Alert Segmentation

S6E16 – The Tangible Affection Proof

S6E17 – The Monster Isolation

S6E18 – The Contractual Obligation Implementation

S6E19 – The Closet Reconfiguration

S6E20 – The Tenure Turbulence

S6E21 – The Closure Alternative

S6E22 – The Proton Resurgence

S6E23 – The Love Spell Potential

S6E24 – The Bon Voyage Reaction

Season 7 – 23 episodes

• Summary

In this season, we see Leonard getting back from his job and decides to put his relationship with Penny to the test. Penny is set to star in a low-budget horror movie. It seems that the break up only made Raj stronger – he starts to date two girls at a time. Sheldon gets even more involved with his work, and Amy starts a new job as Professor at the University. They go to Napa Valley on Valentine’s Day.

Their relationship advances, and Penny is trying to make a big decision about her life that would influence both her personal and her professional life. Raj is doing his best with women, now that he can speak to them without being drunk, and Howard prepares a surprise for Bernadette for the anniversary of their first date. They also host the Thanksgiving dinner for the entire group, and that’s when Howard tells everyone that he’s going to space.

• Episodes

S7E1 – The Hofstadter Insufficiency

S7E2 – The Deception Verification

S7E3 – The Scavenger Vortex

S7E4 – The Raiders Minimization

S7E5 – The Workplace Proximity

S7E6 – The Romance Resonance

S7E7 – The Proton Displacement

S7E8 – The Itchy Brain Simulation

S7E9 – The Thanksgiving Decoupling

S7E10 – The Discovery Dissipation

S7E11 – The Cooper Extraction

S7E12 – The Hesitation Ramification

S7E13 – The Occupation Recalibration

S7E14 – The Convention Conundrum

S7E15 – The Locomotive Manipulation

S7E16 – The Table Polarization

S7E17 – The Friendship Turbulence

S7E18 – The Mommy Observation

S7E19 – The Indecision Amalgamation

S7E20 – The Relationship Diremption

S7E21 – The Anything Can Happen Recurrence

S7E22 – The Proton Transmogrification

S7E23 – The Gorilla Dissolution

S7E24 – The Status Quo Combustion

Season 8 – 24 episodes

• Summary

Penny and Leonard are finally engaged, but it may not all seem to be milk and honey. Leonard confesses to Penny that he kissed a girl two years back when he was at the North Sea. Penny forgives him. Raj meets Emily and proposed to her. Sheldon and Amy’s relationship still advances at a slower pace, but Amy wants more than that. As a result, she asks him for a break. Howard’s mother moves into his apartment with her new partner, Stuart. Stuart opens a new comic book store by using the furniture that belongs to Howard’s mother. The mother leaves for Florida. Howard soon learns that his mother died there, and the entire group gets together to help him grief.

• Episodes

S8E1 – The Locomotion Interruption

S8E2 – The Junior Professor Solution

S8E3 – The First Pitch Insufficiency

S8E4 – The Hook-Up Reverberation

S8E5 – The Focus Attenuation

S8E6 – The Expedition Approximation

S8E7 – The Misinterpretation Agitation

S8E8 – The Prom Equivalency

S8E9 – The Septum Deviation

S8E10 – The Champagne Reflection

S8E11 – The Clean Room Infiltration

S8E12 – The Space Probe Disintegration

S8E13 – The Anxiety Optimization

S8E14 – The Troll Manifestation

S8E15 – The Comic Book Store Regeneration

S8E16 – The Intimacy Acceleration

S8E17 – The Colonization Application

S8E18 – The Leftover Thermalization

S8E19 – The Skywalker Incursion

S8E20 – The Fortification Implementation

S8E21 – The Communication Deterioration

S8E22 – The Graduation Transmission

S8E23 – The Maternal Combustion

S8E24 – The Commitment Determination

Season 9 – 24 episodes

•  Summary

Leonard and Penny start the preparations for the wedding. The girls throw a bachelorette party for Penny, and the boys bring Leonard to Mexico. As a wedding gift, Sheldon gives them couple tickets to San Francisco for their honeymoon, and he starts to look for a new roommate. Sheldon and Amy decide that it is better to date other people, and the boys are trying to find Amy a new date. Amy starts to date Dave, and Howard learns that he will soon be a father.

Leonard and Penny host this year’s Thanksgiving, and Sheldon wants to give Amy a surprise gift, but Amy dumps him. Amy then goes to visit Sheldon’s grandmother, and she tells her that he has a ring for her. Amy decides to give their relationship another go. Raj has to choose between Emily and Claire. The groups wants to give Penny and Leonard a gift for their second anniversary.

• Episodes

S9E1 – The Matrimonial Momentum

S9E2 – The Separation Oscillation

S9E3 – The Bachelor Party Corrosion

S9E4 – The 2003 Approximation

S9E5 – The Perspiration Implementation

S9E6 – The Helium Insufficiency

S9E7 – The Spock Resonance

S9E8 – The Mystery Date Observation

S9E9 – The Platonic Permutation

S9E10 – The Earworm Reverberation

S9E11 – The Opening Night Excitation

S9E12 – The Sales Call Sublimation

S9E13 – The Empathy Optimization

S9E14 – The Meemaw Materialization

S9E15 – The Valentino Submergence

S9E16 – The Positive Negative Reaction

S9E17 – The Celebration Experimentation

S9E18 – The Application Deterioration

S9E19 – The Solder Excursion Diversion

S9E20 – The Big Bear Precipitation

S9E21 – The Viewing Party Combustion

S9E22 – The Fermentation Bifurcation

S9E23 – The Line Substitution Solution

S9E24 – The Convergence Convergence

Season 10 – 23 episodes

• Summary

Leonard and Penny are worried about how their families will react when they meet each other. In the meantime, Howard invents a device that has caught the attention of the air force. Sheldon gets upset with the fact that the entire group starts working late for the invention. Raj is taking care of Bernadette – who’s pregnant – and Howard is planning to determine the gender of their baby. Amy moves in with Sheldon in his apartment after her house goes under maintenance.

It’s Amy’s birthday, and Bernadette gave birth. Sheldon and Amy have yet another fight. Sheldon also gets in a fight with Leonard because of the invention. Penny believes that Leonard is taking Sheldon for granted, so she starts to spend more time with Amy. Raj’s father does not help him with money anymore, and he moves to Sheldon’s old room after Penny and Leonard offer him the chance.

Stuart moves in again with Howard and Bernadette. She finds it hard to leave her baby in daycare. Because they moved in together, Sheldon and Amy grow stronger. But when someone from the past makes its appearance, they encounter troubles. Leonard and Penny have a second wedding, and they start to get used to living together as a husband and wife.

Raj reunites with his ex-girlfriends, and Amy gets a fellowship at Princetown. The group is worried about Ramona Nowitzki, Sheldon’s former admirer, while Amy is away.

• Episodes

S10E1 – The Conjugal Conjecture

S10E2 – The Military Miniaturization

S10E3 – The Dependence Transcendence

S10E4 – The Cohabitation Experimentation

S10E5 – The Hot Tub Contamination

S10E6 – The Fetal Kick Catalyst

S10E7 – The Veracity Elasticity

S10E8 – The Brain Bowl Incubation

S10E9 – The Geology Elevation

S10E10 – The Property Division Collision

S10E11 – The Birthday Synchronicity

S10E12 – The Holiday Summation

S10E13 – The Romance Recalibration

S10E14 – The Emotion Detection Automation

S10E15 – The Locomotion Reverberation

S10E16 – The Allowance Evaporation

S10E17 – The Comic-Con Conundrum

S10E18 – The Escape Hatch Identification

S10E19 – The Collaboration Fluctuation

S10E20 – The Recollection Dissipation

S10E21 – The Separation Agitation

S10E22 – The Cognition Regeneration

S10E23 – The Gyroscopic Collapse

S10E24 – The Long Distance Dissonance

Season 11 – 24 episodes

• Summary

This season focuses on Amy and Sheldon’s wedding preparations – Sheldon proposes to Amy. Howard and Bernadette want a second child, and they don’t know who’s going to stay home with Halley and who will go to work. Raj gets in a stupid fight with Howard. Sheldon throws a birthday party for Amy, and they decide who’s going to be the best men and bridesmaid in their marriage.

Problems appear when an old video shows the truth about Penny and Leonard’s relationship. Sheldon gets to be the President of Tenants association, and Leonard goes against him. Bernadette is in labor, and everyone is trying to help ease her pain. Sheldon finds a venue for his wedding, and Bernadette and Penny plans a bachelorette party for Amy. Raj finds it difficult to find the perfect wedding date. Sheldon and Amy’s families arrive for their wedding, and everyone tries to make it perfect for them.

• Episodes

S11E1 – The Proposal Proposal

S11E2 – The Retraction Reaction

S11E3 – The Relaxation Integration

S11E4 – The Explosion Implosion

S11E5 – The Collaboration Contamination

S11E6 – The Proton Regeneration

S11E7 – The Geology Methodology

S11E8 – The Tesla Recoil

S11E9 – The Bitcoin Entanglement

S11E10 – The Confidence Erosion

S11E11 – The Celebration Reverberation

S11E12 – The Matrimonial Metric

S11E13 – The Solo Oscillation

S11E14 – The Separation Triangulation

S11E15 – The Novelization Correlation

S11E16 – The Neonatal Nomenclature

S11E17 – The Athenaeum Allocation

S11E18 – The Gates Excitation

S11E19 – The Tenant Disassociation

S11E20 – The Reclusive Potential

S11E21 – The Comet Polarization

S11E22 – The Monetary Insufficiency

S11E23 – The Sibling Realignment

S11E24 – The Bow Tie Asymmetry

Season 12 – 24 episodes

• Summary

The final season shows Sheldon and Amy going to their honeymoon to New York City. Leonard and Penny choose a very weird wedding present to give to them. Meanwhile, Raj asks his father to find a wife for him.  Sheldon asks Penny to work with him on a research paper about Super-Asymmetry.  Stuart bothers Howard and Bernadette with his behavior when he brings his new girlfriend home.

Eventually, Raj gets engaged to Anu. Howard and Raj are still not on speaking terms. Bernadette finds it hard to handle her kids.

Zack, one of Penny’s ex-boyfriends, asks Leonard for a weird favor – he asks for a sperm donation because Zack’s wife wants a baby. However, Leonard does not agree with that.

Leonard gets excluded from the scientific project, while Sheldon, Amy, and Penny continue to work on it. Bernadette wants to write a children’s book about Howard going in Space.

The series ends with Penny being pregnant and Sheldon and Amy winning the Nobel Prize.

• Episodes

S12E1 – The Conjugal Configuration

S12E2 – The Wedding Gift Wormhole

S12E3 – The Procreation Calculation

S12E4 – The Tam Turbulence

S12E5 – The Planetarium Collision

S12E6 – The Imitation Perturbation

S12E7 – The Grant Allocation Derivation

S12E8 – The Consummation Deviation

S12E9 – The Citation Negation

S12E10 – The VCR Illumination

S12E11 – The Paintball Scattering

S12E12 – The Propagation Proposition

S12E13 – The Confirmation Polarization

S12E14 – The Meteorite Manifestation

S12E15 – The Donation Oscillation

S12E16 – The D&D Vortex

S12E17 – The Conference Valuation

S12E18 – The Laureate Accumulation

S12E19 – The Inspiration Deprivation

S12E20 – The Decision Reverberation

S12E21 – The Plagiarism Schisms

S12E22 – The Maternal Conclusion

S12E23 – The Change Constant

S12E24 – The Stockholm Syndrome

We cannot be grateful enough for this series.