The following is a list of episodes of the CBS sitcom The Big Bang Theory.

Like the name of the series itself, with the exception of the first episode - "Pilot" - episode titles of The Big Bang Theory always start with "The", and resemble the name of a scientific principle, theory or experiment, whimsically referencing a plot point or quirk in the episode.

As of April 4, 2013, 131 episodes have aired. There has been a great fan following for The Big Bang Theory and now with the ongoing 6th season of this show, it looks to have captured many more fans.

Series overview

	Season	Episodes	Originally Aired	DVD Release Date	Discs	Season Premiere	Season Finale	Viewers (millions)	Rank	18-49 Rating/Share
	1	17	2007-08	September 2, 2008	3	September 24, 2007	May 19, 2008	8.34[1]	#59[1]	3.3/9
	2	23	2008-09	September 15, 2009	4	September 22, 2008	May 11, 2009	10.01[2]	#42[2]	3.8/10
	3	23	2009-10	September 15, 2010	3	September 21, 2009	May 24, 2010	14.12	#12	5.3/13 (#5)[3]
	4	24[4]	2010-11	September 16, 2011	4	September 23, 2010[5]	May 19, 2011[6]	13.14	#13	4.4/13 (#7)
	5	24	2011-12	September 11, 2012	4	September 22, 2011	May 10, 2012	15.82	#8	N/A
	6	24	2012-2013	N/A	N/A	September 27, 2012	May 16, 2013	N/A	N/A	N/A

Season 1: 2007-2008

Main article: List of The Big Bang Theory episodes (season 1)

The series The Big Bang Theory began its first season on September 24, 2007 in the United States and was picked up for a full run of 17 episodes.

Title	Original Airdate	#
Pilot	September 24, 2007	1 - 101
The Big Bran Hypothesis	October 1, 2007	2 - 102
The Fuzzy Boots Corollary	October 8, 2007	3 - 103
The Luminous Fish Effect	October 15, 2007	4 - 104
The Hamburger Postulate	October 22, 2007	5 - 105
The Middle Earth Paradigm	October 29, 2007	6 - 106
The Dumpling Paradox	November 5, 2007	7 - 107
The Grasshopper Experiment	November 12, 2007	8 - 108
The Cooper-Hofstadter Polarization	March 17, 2008	9 - 109
The Loobenfeld Decay	March 24, 2008	10 - 110
The Pancake Batter Anomaly	March 31, 2008	11 - 111
The Jerusalem Duality	April 14, 2008	12 - 112
The Bat Jar Conjecture	April 21, 2008	13 - 113
The Nerdvana Annihilation	April 28, 2008	14 - 114
The Porkchop Indeterminacy	May 5, 2008	15 - 115
The Peanut Reaction	May 12, 2008	16 - 116
The Tangerine Factor	May 19, 2008	17 - 117

Season 2: 2008-2009

Main article: List of The Big Bang Theory episodes (season 2) The Big Bang Theory returned to television with Season 2 on September 22, 2008, and contained 23 episodes.

Title	Original Airdate	#
The Bad Fish Paradigm	September 22, 2008	18 - 201
The Codpiece Topology	September 29, 2008	19 - 202
The Barbarian Sublimation	October 6, 2008	20 - 203
The Griffin Equivalency	October 13, 2008	21 - 204
The Euclid Alternative	October 20, 2008	22 - 205
The Cooper-Nowitzki Theorem	November 3, 2008	23 - 206
The Panty Piñata Polarization	November 10, 2008	24 - 207
The Lizard-Spock Expansion	November 17, 2008	25 - 208
The White Asparagus Triangulation	November 24, 2008	26 - 209
The Vartabedian Conundrum	December 8, 2008	27 - 210
The Bath Item Gift Hypothesis	December 15, 2008	28 - 211
The Killer Robot Instability	January 12, 2009	29 - 212
The Friendship Algorithm	January 19, 2009	30 - 213
The Financial Permeability	February 2, 2009	31 - 214
The Maternal Capacitance	February 9, 2009	32 - 215
The Cushion Saturation	March 2, 2009	33 - 216
The Terminator Decoupling	March 9, 2009	34 - 217
The Work Song Nanocluster	March 16, 2009	35 - 218
The Dead Hooker Juxtaposition	March 30, 2009	36 - 219
The Hofstadter Isotope	April 13, 2009	37 - 220
The Vegas Renormalization	April 27, 2009	38 - 221
The Classified Materials Turbulence	May 4, 2009	39 - 222
The Monopolar Expedition	May 11, 2009	40 - 223

Season 3: 2009-2010

Main article: List of The Big Bang Theory episodes (season 3) The Big Bang Theory returned to television with Season 3 on September 21, 2009, and contained 23 episodes.

Title	Original Airdate	#
The Electric Can Opener Fluctuation	September 21, 2009	41 - 301
The Jiminy Conjecture	September 28, 2009	42 - 302
The Gothowitz Deviation	October 5, 2009	43 - 303
The Pirate Solution	October 12, 2009	44 - 304
The Creepy Candy Coating Corollary	October 19, 2009	45 - 305
The Cornhusker Vortex	November 2, 2009	46 - 306
The Guitarist Amplification	November 9, 2009	47 - 307
The Adhesive Duck Deficiency	November 16, 2009	48 - 308
The Vengeance Formulation	November 23, 2009	49 - 309
The Gorilla Experiment	December 7, 2009	50 - 310
The Maternal Congruence	December 14, 2009	51 - 311
The Psychic Vortex	January 11, 2010	52 - 312
The Bozeman Reaction	January 18, 2010	53 - 313
The Einstein Approximation	February 1, 2010	54 - 314
The Large Hadron Collision	February 8, 2010	55 - 315
The Excelsior Acquisition	March 1, 2010	56 - 316
The Precious Fragmentation	March 8, 2010	57 - 317
The Pants Alternative	March 22, 2010	58 - 318
The Wheaton Recurrence	April 12, 2010	59 - 319
The Spaghetti Catalyst	May 3, 2010	60 - 320
The Plimpton Stimulation	May 10, 2010	61 - 321
The Staircase Implementation	May 17, 2010	62 - 322
The Lunar Excitation	May 24, 2010	63 - 323

Season 4: 2010-2011

Main article: List of The Big Bang Theory episodes (season 4) The Big Bang Theory returned to television with Season 4 on September 23, 2010, and contained 24 episodes.

Title	Original Airdate	#
The Robotic Manipulation	September 23, 2010	64 - 401
The Cruciferous Vegetable Amplification	September 30, 2010	65 - 402
The Zazzy Substitution	October 7, 2010	66 - 403
The Hot Troll Deviation	October 14, 2010	67 - 404
The Desperation Emanation	October 21, 2010	68 - 405
The Irish Pub Formulation	October 28, 2010	69 - 406
The Apology Insufficiency	November 4, 2010	70 - 407
The 21-Second Excitation	November 11, 2010	71 - 408
The Boyfriend Complexity	November 18, 2010	72 - 409
The Alien Parasite Hypothesis	December 9, 2010	73 - 410
The Justice League Recombination	December 16, 2010	74 - 411
The Bus Pants Utilization	January 6, 2011	75 - 412
The Love Car Displacement	January 20, 2011	76 - 413
The Thespian Catalyst	February 3, 2011	77 - 414
The Benefactor Factor	February 10, 2011	78 - 415
The Cohabitation Formulation	February 17, 2011	79 - 416
The Toast Derivation	February 24, 2011	80 - 417
The Prestidigitation Approximation	March 10, 2011	81 - 418
The Zarnecki Incursion	March 31, 2011	82 - 419
The Herb Garden Germination	April 7, 2011	83 - 420
The Agreement Dissection	April 28, 2011	84 - 421
The Wildebeest Implementation	May 5, 2011	85 - 422
The Engagement Reaction	May 12, 2011	86 - 423
The Roommate Transmogrification	May 19, 2011	87 - 424

Season 5: 2011-2012

Main article: List of The Big Bang Theory episodes (season 5) The Big Bang Theory returned to television with Season 5 on September 22, 2011, and contained 24 episodes.

Title	Original Airdate	#
The Skank Reflex Analysis	September 22, 2011	88 - 501
The Infestation Hypothesis	September 22, 2011	89 - 502
The Pulled Groin Extrapolation	September 29, 2011	90 - 503
The Wiggly Finger Catalyst	October 6, 2011	91 - 504
The Russian Rocket Reaction	October 13, 2011	92 - 505
The Rhinitis Revelation	October 20, 2011	93 - 506
The Good Guy Fluctuation	October 27, 2011	94 - 507
The Isolation Permutation	November 3, 2011	95 - 508
The Ornithophobia Diffusion	November 10, 2011	96 - 509
The Flaming Spittoon Acquisition	November 17, 2011	97 - 510
The Speckerman Recurrence	December 8, 2011	98 - 511
The Shiny Trinket Maneuver	January 12, 2012	99 - 512
The Recombination Hypothesis	January 19, 2012	100 - 513
The Beta Test Initiation	January 26, 2012	101 - 514
The Friendship Contraction	February 2, 2012	102 - 515
The Vacation Solution	February 9, 2012	103 - 516
The Rothman Disintegration	February 16, 2012	104 - 517
The Werewolf Transformation	February 23, 2012	105 - 518
The Weekend Vortex	March 8, 2012	106 - 519
The Transporter Malfunction	March 29, 2012	107 - 520
The Hawking Excitation	April 5, 2012	108 - 521
The Stag Convergence	April 26, 2012	109 - 522
The Launch Acceleration	May 3, 2012	110 - 523
The Countdown Reflection	May 10, 2012	111 - 524

Season 6: 2012-2013

Main article: Season 6

The Big Bang Theory returned to television with Season 6 on September 27, 2012.

Title	Original Airdate	#
The Date Night Variable	September 27, 2012	112 - 601
The Decoupling Fluctuation	October 4, 2012	113 - 602
The Higgs Boson Observation	October 11, 2012	114 - 603
The Re-Entry Minimization	October 18, 2012	115 - 604
The Holographic Excitation	October 25, 2012	116 - 605
The Extract Obliteration	November 1, 2012	117 - 606
The Habitation Configuration	November 8, 2012	118 - 607
The 43 Peculiarity	November 15, 2012	119 - 608
The Parking Lot Escalation	November 29, 2012	120 - 609
The Fish Guts Displacement	December 6, 2012	121 - 610
The Santa Simulation	December 13, 2012	122 - 611
The Egg Salad Equivalency	January 3, 2013	123 - 612
The Bakersfield Expedition	January 10, 2013	124 - 613
The Cooper/Kripke Inversion	January 31, 2013	125 - 614
The Spoiler Alert Segmentation	February 7, 2013	126 - 615
The Tangible Affection Proof	February 14, 2013	127 - 616
The Monster Isolation	February 21, 2013	128 - 617
The Contractual Obligation Implementation	March 7, 2013	129 - 618
The Closet Reconfiguration	March 14, 2013	130 - 619
The Tenure Turbulence	April 4, 2013	131 - 620
The Closure Alternative	April 25, 2013	132 - 621
The Proton Resurgence	May 2, 2013	133 - 622
The Love Spell Potential	May 9, 2013	134 - 623
The Bon Voyage Reaction	May 16, 2013	135 - 624

References

1. ↑ ^{1.0 1.1} ABC Medianet. SEASON PROGRAM RANKINGS (THROUGH 5/25)
2. ↑ ^{2.0 2.1} ABC Medianet.
3. ↑ Nellie Andreeva (May 27, 2010). "Full Series Rankings For The 2009-10 Broadcast Season". Deadline Hollywood . http://www.deadline.com/2010/05/full-series-rankings-for-the-2009-10-broadcast-season. Retrieved on June 7, 2010. 
4. ↑ "CBS - Primetime Calender - September 6 - October 29". Docstoc . http://www.docstoc.com/docs/54323968/CW---Primetime-Calender---September-6---October-29. Retrieved on September 9, 2010. 
5. ↑ "CBS ANNOUNCES 2010-2011 PREMIERE DATES". The Futon Critic . July 22, 2010. http://www.thefutoncritic.com/news/2010/07/22/cbs-announces-2010-2011-premiere-dates/20100722cbs02/. Retrieved on July 22, 2010. 
6. ↑ "CBS Announces Season Finale Dates for the 2010-11 Season". The Futon Critic . http://www.thefutoncritic.com/news/2011/03/28/cbs-announces-season-finale-dates-for-the-2010-11-season-830412/20110328cbs06/. Retrieved on March 28, 2011.