Season 1 (2007)

8.07 avg 17 episodes 8.1 → 8.5 21 min avg

Season 1 episodes - IMDb ratings
#	Title	Rating	Votes
1	Pilot	8.1	8,530
2	The Big Bran Hypothesis	8.2	6,860
3	The Fuzzy Boots Corollary	7.6	6,184
4	The Luminous Fish Effect	8.0	6,227
5	The Hamburger Postulate	7.8	5,917
6	The Middle Earth Paradigm	8.3	6,142
7	The Dumpling Paradox	8.0	5,819
8	The Grasshopper Experiment	8.1	5,824
9	The Cooper-Hofstadter Polarization	7.9	5,627
10	The Loobenfeld Decay	8.0	5,762
11	The Pancake Batter Anomaly	8.2	5,724
12	The Jerusalem Duality	7.8	5,442
13	The Bat Jar Conjecture	8.2	5,606
14	The Nerdvana Annihilation	8.0	5,499
15	The Pork Chop Indeterminacy	8.2	5,743
16	The Peanut Reaction	8.3	5,407
17	The Tangerine Factor	8.5	5,652

Season 2 (2008)

8.15 avg 23 episodes 8.2 → 8.2 21 min avg

Season 2 episodes - IMDb ratings
#	Title	Rating	Votes
1	The Bad Fish Paradigm	8.2	5,490
2	The Codpiece Topology	7.9	5,089
3	The Barbarian Sublimation	8.7	5,935
4	The Griffin Equivalency	7.8	5,137
5	The Euclid Alternative	8.3	5,263
6	The Cooper-Nowitzki Theorem	8.1	5,269
7	The Panty Piñata Polarization	8.6	5,581
8	The Lizard-Spock Expansion	8.0	5,042
9	The White Asparagus Triangulation	8.0	4,985
10	The Vartabedian Conundrum	7.6	4,884
11	The Bath Item Gift Hypothesis	9.1	8,098
12	The Killer Robot Instability	7.8	4,931
13	The Friendship Algorithm	7.9	4,891
14	The Financial Permeability	7.9	4,844
15	The Maternal Capacitance	8.8	5,819
16	The Cushion Saturation	8.1	4,864
17	The Terminator Decoupling	8.0	5,223
18	The Work Song Nanocluster	8.1	4,898
19	The Dead Hooker Juxtaposition	8.1	4,936
20	The Hofstadter Isotope	7.8	4,736
21	The Vegas Renormalization	8.4	5,091
22	The Classified Materials Turbulence	8.1	4,687
23	The Monopolar Expedition	8.2	4,835

Season 3 (2009)

8.19 avg 23 episodes 8.2 → 8.6 21 min avg

Rebound

Season 3 episodes - IMDb ratings
#	Title	Rating	Votes
1	The Electric Can Opener Fluctuation	8.2	5,146
2	The Jiminy Conjecture	7.7	4,722
3	The Gothowitz Deviation	8.1	4,837
4	The Pirate Solution	8.0	4,728
5	The Creepy Candy Coating Corollary	8.3	4,838
6	The Cornhusker Vortex	7.4	4,553
7	The Guitarist Amplification	7.7	4,589
8	The Adhesive Duck Deficiency	8.9	6,443
9	The Vengeance Formulation	8.3	4,793
10	The Gorilla Experiment	8.4	4,851
11	The Maternal Congruence	8.3	4,768
12	The Psychic Vortex	8.2	4,673
13	The Bozeman Reaction	8.0	4,579
14	The Einstein Approximation	8.4	4,961
15	The Large Hadron Collision	8.0	4,497
16	The Excelsior Acquisition	8.2	4,614
17	The Precious Fragmentation	8.4	4,863
18	The Pants Alternative	8.3	4,778
19	The Wheaton Recurrence	7.8	4,477
20	The Spaghetti Catalyst	8.1	4,483
21	The Plimpton Stimulation	8.1	4,781
22	The Staircase Implementation	9.0	6,179
23	The Lunar Excitation	8.6	4,885

Season 4 (2010)

8.03 avg 24 episodes 8.7 → 8.5 21 min avg

Season 4 episodes - IMDb ratings
#	Title	Rating	Votes
1	The Robotic Manipulation	8.7	5,395
2	The Cruciferous Vegetable Amplification	8.3	4,850
3	The Zazzy Substitution	7.9	4,601
4	The Hot Troll Deviation	8.0	4,566
5	The Desperation Emanation	7.6	4,404
6	The Irish Pub Formulation	8.0	4,484
7	The Apology Insufficiency	8.0	4,499
8	The 21-Second Excitation	8.1	4,512
9	The Boyfriend Complexity	8.4	4,709
10	The Alien Parasite Hypothesis	7.6	4,372
11	The Justice League Recombination	8.6	5,005
12	The Bus Pants Utilization	7.5	4,349
13	The Love Car Displacement	8.2	4,701
14	The Thespian Catalyst	7.7	4,409
15	The Benefactor Factor	7.7	4,382
16	The Cohabitation Formulation	7.8	4,231
17	The Toast Derivation	7.9	4,260
18	The Prestidigitation Approximation	8.1	4,456
19	The Zarnecki Incursion	8.0	4,329
20	The Herb Garden Germination	8.2	4,329
21	The Agreement Dissection	8.2	4,443
22	The Wildebeest Implementation	7.7	4,203
23	The Engagement Reaction	8.1	4,280
24	The Roommate Transmogrification	8.5	4,554

Season 5 (2011)

7.92 avg 24 episodes 8.0 → 8.5 21 min avg

Season 5 episodes - IMDb ratings
#	Title	Rating	Votes
1	The Skank Reflex Analysis	8.0	4,934
2	The Infestation Hypothesis	8.0	4,443
3	The Pulled Groin Extrapolation	7.6	4,263
4	The Wiggly Finger Catalyst	7.8	4,329
5	The Russian Rocket Reaction	8.0	4,292
6	The Rhinitis Revelation	7.5	4,226
7	The Good Guy Fluctuation	8.5	5,083
8	The Isolation Permutation	7.6	4,182
9	The Ornithophobia Diffusion	8.1	4,396
10	The Flaming Spittoon Acquisition	7.9	4,234
11	The Speckerman Recurrence	7.2	4,218
12	The Shiny Trinket Maneuver	7.6	4,204
13	The Recombination Hypothesis	8.1	4,446
14	The Beta Test Initiation	8.2	4,425
15	The Friendship Contraction	7.7	4,064
16	The Vacation Solution	7.5	4,039
17	The Rothman Disintegration	7.7	4,148
18	The Werewolf Transformation	8.2	4,356
19	The Weekend Vortex	8.1	4,166
20	The Transporter Malfunction	8.0	4,297
21	The Hawking Excitation	8.5	4,746
22	The Stag Convergence	7.7	4,108
23	The Launch Acceleration	8.1	4,072
24	The Countdown Reflection	8.5	4,616

Season 6 (2012)

7.95 avg 24 episodes 7.6 → 7.7 21 min avg

Mid-peak

Season 6 episodes - IMDb ratings
#	Title	Rating	Votes
1	The Date Night Variable	7.6	5,073
2	The Decoupling Fluctuation	7.6	4,221
3	The Higgs Boson Observation	7.9	4,241
4	The Re-Entry Minimization	8.2	4,551
5	The Holographic Excitation	8.0	4,196
6	The Extract Obliteration	7.8	4,038
7	The Habitation Configuration	7.6	4,018
8	The 43 Peculiarity	8.4	4,607
9	The Parking Spot Escalation	8.2	4,494
10	The Fish Guts Displacement	8.0	4,266
11	The Santa Simulation	7.8	4,097
12	The Egg Salad Equivalency	8.4	4,559
13	The Bakersfield Expedition	8.4	4,577
14	The Cooper/Kripke Inversion	7.7	4,025
15	The Spoiler Alert Segmentation	8.2	4,171
16	The Tangible Affection Proof	7.8	4,047
17	The Monster Isolation	7.6	3,896
18	The Contractual Obligation Implementation	7.7	3,974
19	The Closet Reconfiguration	8.1	4,239
20	The Tenure Turbulence	8.0	4,069
21	The Closure Alternative	8.0	4,036
22	The Proton Resurgence	7.9	4,193
23	The Love Spell Potential	8.1	4,189
24	The Bon Voyage Reaction	7.7	3,985

Season 7 (2013)

7.85 avg 24 episodes 7.7 → 8.0 20 min avg

Season 7 episodes - IMDb ratings
#	Title	Rating	Votes
1	The Hofstadter Insufficiency	7.7	4,430
2	The Deception Verification	7.9	4,363
3	The Scavenger Vortex	8.7	5,367
4	The Raiders Minimization	7.8	4,060
5	The Workplace Proximity	7.6	3,881
6	The Romance Resonance	8.4	4,635
7	The Proton Displacement	7.7	3,959
8	The Itchy Brain Simulation	7.5	3,955
9	The Thanksgiving Decoupling	8.8	5,543
10	The Discovery Dissipation	7.6	3,747
11	The Cooper Extraction	8.1	4,211
12	The Hesitation Ramification	7.4	3,819
13	The Occupation Recalibration	7.5	3,821
14	The Convention Conundrum	8.0	4,186
15	The Locomotive Manipulation	8.2	4,322
16	The Table Polarization	7.5	3,729
17	The Friendship Turbulence	7.4	3,673
18	The Mommy Observation	7.4	3,764
19	The Indecision Amalgamation	8.1	4,036
20	The Relationship Diremption	8.0	3,806
21	The Anything Can Happen Recurrence	7.5	3,648
22	The Proton Transmogrification	7.7	3,825
23	The Gorilla Dissolution	7.8	3,792
24	The Status Quo Combustion	8.0	3,893

Season 8 (2014)

7.47 avg 24 episodes 7.2 → 7.9 20 min avg

Season 8 episodes - IMDb ratings
#	Title	Rating	Votes
1	The Locomotion Interruption	7.2	4,397
2	The Junior Professor Solution	7.5	4,117
3	The First Pitch Insufficiency	7.0	4,052
4	The Hook-up Reverberation	7.2	3,829
5	The Focus Attenuation	7.5	3,946
6	The Expedition Approximation	7.2	3,787
7	The Misinterpretation Agitation	7.7	4,154
8	The Prom Equivalency	8.0	4,166
9	The Septum Deviation	7.5	3,723
10	The Champagne Reflection	7.0	3,784
11	The Clean Room Infiltration	7.4	3,685
12	The Space Probe Disintegration	7.2	3,576
13	The Anxiety Optimization	7.4	3,578
14	The Troll Manifestation	8.0	3,885
15	The Comic Book Store Regeneration	8.1	3,978
16	The Intimacy Acceleration	7.8	3,749
17	The Colonization Application	7.5	3,532
18	The Leftover Thermalization	7.3	3,517
19	The Skywalker Incursion	7.5	3,539
20	The Fortification Implementation	7.5	3,510
21	The Communication Deterioration	7.0	3,421
22	The Graduation Transmission	7.3	3,483
23	The Maternal Combustion	7.5	3,577
24	The Commitment Determination	7.9	3,994

Season 9 (2015)

7.57 avg 24 episodes 6.8 → 7.8 19 min avg

Mid-peak

Season 9 episodes - IMDb ratings
#	Title	Rating	Votes
1	The Matrimonial Momentum	6.8	4,391
2	The Separation Oscillation	7.3	3,771
3	The Bachelor Party Corrosion	7.7	3,853
4	The 2003 Approximation	7.4	3,641
5	The Perspiration Implementation	7.4	3,550
6	The Helium Insufficiency	7.2	3,625
7	The Spock Resonance	7.9	3,739
8	The Mystery Date Observation	7.9	3,749
9	The Platonic Permutation	7.7	3,758
10	The Earworm Reverberation	8.3	4,221
11	The Opening Night Excitation	9.0	6,097
12	The Sales Call Sublimation	7.4	3,383
13	The Empathy Optimization	7.4	3,405
14	The Meemaw Materialization	7.5	3,460
15	The Valentino Submergence	7.5	3,399
16	The Positive Negative Reaction	7.4	3,533
17	The Celebration Experimentation	7.6	3,562
18	The Application Deterioration	7.5	3,334
19	The Solder Excursion Diversion	7.4	3,260
20	The Big Bear Precipitation	7.4	3,233
21	The Viewing Party Combustion	7.4	3,225
22	The Fermentation Bifurcation	7.4	3,162
23	The Line Substitution Solution	7.4	3,177
24	The Convergence Convergence	7.8	3,587

Season 10 (2016)

7.40 avg 24 episodes 7.8 → 8.6 19 min avg

Season 10 episodes - IMDb ratings
#	Title	Rating	Votes
1	The Conjugal Conjecture	7.8	4,156
2	The Military Miniaturization	7.3	3,396
3	The Dependence Transcendence	7.2	3,284
4	The Cohabitation Experimentation	7.9	3,563
5	The Hot Tub Contamination	7.4	3,236
6	The Fetal Kick Catalyst	7.4	3,303
7	The Veracity Elasticity	7.9	3,497
8	The Brain Bowl Incubation	8.0	3,617
9	The Geology Elevation	7.4	3,194
10	The Property Division Collision	7.3	3,200
11	The Birthday Synchronicity	7.6	3,260
12	The Holiday Summation	7.3	3,290
13	The Romance Recalibration	6.9	3,160
14	The Emotion Detection Automation	7.2	3,100
15	The Locomotion Reverberation	7.3	3,055
16	The Allowance Evaporation	7.1	2,968
17	The Comic-Con Conundrum	7.4	3,017
18	The Escape Hatch Identification	7.1	2,968
19	The Collaboration Fluctuation	7.1	3,018
20	The Recollection Dissipation	7.2	2,985
21	The Separation Agitation	7.2	3,023
22	The Cognition Regeneration	6.8	2,982
23	The Gyroscopic Collapse	7.2	2,926
24	The Long Distance Dissonance	8.6	4,088

Season 11 (2017)

7.34 avg 24 episodes 7.5 → 9.0 20 min avg

Season 11 episodes - IMDb ratings
#	Title	Rating	Votes
1	The Proposal Proposal	7.5	3,593
2	The Retraction Reaction	7.2	3,229
3	The Relaxation Integration	7.0	3,079
4	The Explosion Implosion	7.1	3,016
5	The Collaboration Contamination	7.3	3,036
6	The Proton Regeneration	7.2	3,006
7	The Geology Methodology	7.4	3,027
8	The Tesla Recoil	7.1	2,930
9	The Bitcoin Entanglement	7.7	3,182
10	The Confidence Erosion	7.4	2,960
11	The Celebration Reverberation	7.1	2,886
12	The Matrimonial Metric	7.5	2,944
13	The Solo Oscillation	7.2	2,925
14	The Separation Triangulation	7.2	2,982
15	The Novelization Correlation	7.5	2,905
16	The Neonatal Nomenclature	7.1	2,827
17	The Athenaeum Allocation	6.8	2,846
18	The Gates Excitation	7.1	2,885
19	The Tenant Disassociation	7.2	2,847
20	The Reclusive Potential	7.2	2,852
21	The Comet Polarization	7.4	2,866
22	The Monetary Insufficiency	7.2	2,799
23	The Sibling Realignment	7.7	3,020
24	The Bow Tie Asymmetry	9.0	5,029

Season 12 (2018)

7.47 avg 24 episodes 7.2 → 9.5 20 min avg

Season 12 episodes - IMDb ratings
#	Title	Rating	Votes
1	The Conjugal Configuration	7.2	3,324
2	The Wedding Gift Wormhole	7.6	3,194
3	The Procreation Calculation	7.2	3,055
4	The Tam Turbulence	7.0	2,964
5	The Planetarium Collision	6.8	2,971
6	The Imitation Perturbation	8.2	3,596
7	The Grant Allocation Derivation	7.3	2,920
8	The Consummation Deviation	7.3	2,991
9	The Citation Negation	7.2	2,946
10	The VCR Illumination	7.5	3,071
11	The Paintball Scattering	7.3	2,897
12	The Propagation Proposition	7.1	2,836
13	The Confirmation Polarization	7.1	2,859
14	The Meteorite Manifestation	7.1	2,841
15	The Donation Oscillation	7.4	2,920
16	The D & D Vortex	7.9	3,228
17	The Conference Valuation	7.1	2,833
18	The Laureate Accumulation	7.1	2,803
19	The Inspiration Deprivation	7.0	2,855
20	The Decision Reverberation	7.1	2,796
21	The Plagiarism Schism	7.3	2,887
22	The Maternal Conclusion	7.9	3,467
23	The Change Constant	9.0	5,838
24	The Stockholm Syndrome	9.5	12,118

The Big Bang Theory (2007)

Cast

Seasons