Cast Member: Johnny Galecki
Leonard Hofstadter
Johnny Galecki is credited in 279 episodes of The Big Bang Theory.
Episodes
Season 12 24 episodes
- 1201. The Conjugal Configuration
September 24, 2018
- 1202. The Wedding Gift Wormhole
September 27, 2018
- 1203. The Procreation Calculation
October 4, 2018
- 1204. The Tam Turbulence
October 11, 2018
- 1205. The Planetarium Collision
October 18, 2018
- 1206. The Imitation Perturbation
October 25, 2018
- 1207. The Grant Allocation Derivation
November 1, 2018
- 1208. The Consummation Deviation
November 8, 2018
- 1209. The Citation Negation
November 15, 2018
- 1210. The VCR Illumination
December 6, 2018
- 1211. The Paintball Scattering
January 3, 2019
- 1212. The Propagation Proposition
January 10, 2019
- 1213. The Confirmation Polarization
January 17, 2019
- 1214. The Meteorite Manifestation
January 31, 2019
- 1215. The Donation Oscillation
February 7, 2019
- 1216. The D & D Vortex
February 21, 2019
- 1217. The Conference Valuation
March 7, 2019
- 1218. The Laureate Accumulation
April 4, 2019
- 1219. The Inspiration Deprivation
April 18, 2019
- 1220. The Decision Reverberation
April 25, 2019
- 1221. The Plagiarism Schism
May 2, 2019
- 1222. The Maternal Conclusion
May 9, 2019
- 1223. The Change Constant
May 16, 2019
- 1224. The Stockholm Syndrome
May 16, 2019
Season 11 24 episodes
- 1101. The Proposal Proposal
September 25, 2017
- 1102. The Retraction Reaction
October 2, 2017
- 1103. The Relaxation Integration
October 9, 2017
- 1104. The Explosion Implosion
October 16, 2017
- 1105. The Collaboration Contamination
October 23, 2017
- 1106. The Proton Regeneration
November 2, 2017
- 1107. The Geology Methodology
November 9, 2017
- 1108. The Tesla Recoil
November 16, 2017
- 1109. The Bitcoin Entanglement
November 30, 2017
- 1110. The Confidence Erosion
December 7, 2017
- 1111. The Celebration Reverberation
December 14, 2017
- 1112. The Matrimonial Metric
January 4, 2018
- 1113. The Solo Oscillation
January 11, 2018
- 1114. The Separation Triangulation
January 18, 2018
- 1115. The Novelization Correlation
February 1, 2018
- 1116. The Neonatal Nomenclature
March 1, 2018
- 1117. The Athenaeum Allocation
March 8, 2018
- 1118. The Gates Excitation
March 29, 2018
- 1119. The Tenant Disassociation
April 5, 2018
- 1120. The Reclusive Potential
April 12, 2018
- 1121. The Comet Polarization
April 19, 2018
- 1122. The Monetary Insufficiency
April 26, 2018
- 1123. The Sibling Realignment
May 3, 2018
- 1124. The Bow Tie Asymmetry
May 10, 2018
Season 10 24 episodes
- 1001. The Conjugal Conjecture
September 19, 2016
- 1002. The Military Miniaturization
September 26, 2016
- 1003. The Dependence Transcendence
October 3, 2016
- 1004. The Cohabitation Experimentation
October 10, 2016
- 1005. The Hot Tub Contamination
October 17, 2016
- 1006. The Fetal Kick Catalyst
October 27, 2016
- 1007. The Veracity Elasticity
November 3, 2016
- 1008. The Brain Bowl Incubation
November 10, 2016
- 1009. The Geology Elevation
November 17, 2016
- 1010. The Property Division Collision
December 1, 2016
- 1011. The Birthday Synchronicity
December 15, 2016
- 1012. The Holiday Summation
January 5, 2017
- 1013. The Romance Recalibration
January 19, 2017
- 1014. The Emotion Detection Automation
February 2, 2017
- 1015. The Locomotion Reverberation
February 9, 2017
- 1016. The Allowance Evaporation
February 16, 2017
- 1017. The Comic-Con Conundrum
February 23, 2017
- 1018. The Escape Hatch Identification
March 9, 2017
- 1019. The Collaboration Fluctuation
March 30, 2017
- 1020. The Recollection Dissipation
April 6, 2017
- 1021. The Separation Agitation
April 13, 2017
- 1022. The Cognition Regeneration
April 27, 2017
- 1023. The Gyroscopic Collapse
May 4, 2017
- 1024. The Long Distance Dissonance
May 11, 2017
Season 9 24 episodes
- 901. The Matrimonial Momentum
September 21, 2015
- 902. The Separation Oscillation
September 28, 2015
- 903. The Bachelor Party Corrosion
October 5, 2015
- 904. The 2003 Approximation
October 12, 2015
- 905. The Perspiration Implementation
October 19, 2015
- 906. The Helium Insufficiency
October 26, 2015
- 907. The Spock Resonance
November 5, 2015
- 908. The Mystery Date Observation
November 12, 2015
- 909. The Platonic Permutation
November 19, 2015
- 910. The Earworm Reverberation
December 10, 2015
- 911. The Opening Night Excitation
December 17, 2015
- 912. The Sales Call Sublimation
January 7, 2016
- 913. The Empathy Optimization
January 14, 2016
- 914. The Meemaw Materialization
February 4, 2016
- 915. The Valentino Submergence
February 11, 2016
- 916. The Positive Negative Reaction
February 18, 2016
- 917. The Celebration Experimentation
February 25, 2016
- 918. The Application Deterioration
March 10, 2016
- 919. The Solder Excursion Diversion
March 31, 2016
- 920. The Big Bear Precipitation
April 7, 2016
- 921. The Viewing Party Combustion
April 21, 2016
- 922. The Fermentation Bifurcation
April 28, 2016
- 923. The Line Substitution Solution
May 5, 2016
- 924. The Convergence Convergence
May 12, 2016
Season 8 24 episodes
- 801. The Locomotion Interruption
September 22, 2014
- 802. The Junior Professor Solution
September 22, 2014
- 803. The First Pitch Insufficiency
September 29, 2014
- 804. The Hook-Up Reverberation
October 6, 2014
- 805. The Focus Attenuation
October 13, 2014
- 806. The Expedition Approximation
October 20, 2014
- 807. The Misinterpretation Agitation
October 30, 2014
- 808. The Prom Equivalency
November 6, 2014
- 809. The Septum Deviation
November 13, 2014
- 810. The Champagne Reflection
November 20, 2014
- 811. The Clean Room Infiltration
December 11, 2014
- 812. The Space Probe Disintegration
January 8, 2015
- 813. The Anxiety Optimization
January 29, 2015
- 814. The Troll Manifestation
February 5, 2015
- 815. The Comic Book Store Regeneration
February 19, 2015
- 816. The Intimacy Acceleration
February 26, 2015
- 817. The Colonization Application
March 5, 2015
- 818. The Leftover Thermalization
March 12, 2015
- 819. The Skywalker Incursion
April 2, 2015
- 820. The Fortification Implementation
April 9, 2015
- 821. The Communication Deterioration
April 16, 2015
- 822. The Graduation Transmission
April 23, 2015
- 823. The Maternal Combustion
April 30, 2015
- 824. The Commitment Determination
May 7, 2015
Season 7 24 episodes
- 701. The Hofstadter Insufficiency
September 26, 2013
- 702. The Deception Verification
September 26, 2013
- 703. The Scavenger Vortex
October 3, 2013
- 704. The Raiders Minimization
October 10, 2013
- 705. The Workplace Proximity
October 17, 2013
- 706. The Romance Resonance
October 24, 2013
- 707. The Proton Displacement
November 7, 2013
- 708. The Itchy Brain Simulation
November 14, 2013
- 709. The Thanksgiving Decoupling
November 21, 2013
- 710. The Discovery Dissipation
December 5, 2013
- 711. The Cooper Extraction
December 12, 2013
- 712. The Hesitation Ramification
January 2, 2014
- 713. The Occupation Recalibration
January 9, 2014
- 714. The Convention Conundrum
January 30, 2014
- 715. The Locomotive Manipulation
February 6, 2014
- 716. The Table Polarization
February 27, 2014
- 717. The Friendship Turbulence
March 6, 2014
- 718. The Mommy Observation
March 13, 2014
- 719. The Indecision Amalgamation
April 3, 2014
- 720. The Relationship Diremption
April 10, 2014
- 721. The Anything Can Happen Recurrence
April 24, 2014
- 722. The Proton Transmogrification
May 1, 2014
- 723. The Gorilla Dissolution
May 8, 2014
- 724. The Status Quo Combustion
May 15, 2014
Season 6 24 episodes
- 601. The Date Night Variable
September 27, 2012
- 602. The Decoupling Fluctuation
October 4, 2012
- 603. The Higgs Boson Observation
October 11, 2012
- 604. The Re-Entry Minimization
October 18, 2012
- 605. The Holographic Excitation
October 25, 2012
- 606. The Extract Obliteration
November 1, 2012
- 607. The Habitation Configuration
November 8, 2012
- 608. The 43 Peculiarity
November 15, 2012
- 609. The Parking Spot Escalation
November 29, 2012
- 610. The Fish Guts Displacement
December 6, 2012
- 611. The Santa Simulation
December 13, 2012
- 612. The Egg Salad Equivalency
January 3, 2013
- 613. The Bakersfield Expedition
January 10, 2013
- 614. The Cooper/Kripke Inversion
January 31, 2013
- 615. The Spoiler Alert Segmentation
February 7, 2013
- 616. The Tangible Affection Proof
February 14, 2013
- 617. The Monster Isolation
February 21, 2013
- 618. The Contractual Obligation Implementation
March 7, 2013
- 619. The Closet Reconfiguration
March 14, 2013
- 620. The Tenure Turbulence
April 4, 2013
- 621. The Closure Alternative
April 25, 2013
- 622. The Proton Resurgence
May 2, 2013
- 623. The Love Spell Potential
May 9, 2013
- 624. The Bon Voyage Reaction
May 16, 2013
Season 5 24 episodes
- 501. The Skank Reflex Analysis
September 22, 2011
- 502. The Infestation Hypothesis
September 22, 2011
- 503. The Pulled Groin Extrapolation
September 29, 2011
- 504. The Wiggly Finger Catalyst
October 6, 2011
- 505. The Russian Rocket Reaction
October 13, 2011
- 506. The Rhinitis Revelation
October 20, 2011
- 507. The Good Guy Fluctuation
October 27, 2011
- 508. The Isolation Permutation
November 3, 2011
- 509. The Ornithophobia Diffusion
November 10, 2011
- 510. The Flaming Spittoon Acquisition
November 17, 2011
- 511. The Speckerman Recurrence
December 8, 2011
- 512. The Shiny Trinket Maneuver
January 12, 2012
- 513. The Recombination Hypothesis
January 19, 2012
- 514. The Beta Test Initiation
January 26, 2012
- 515. The Friendship Contraction
February 2, 2012
- 516. The Vacation Solution
February 9, 2012
- 517. The Rothman Disintegration
February 16, 2012
- 518. The Werewolf Transformation
February 23, 2012
- 519. The Weekend Vortex
March 8, 2012
- 520. The Transporter Malfunction
March 29, 2012
- 521. The Hawking Excitation
April 5, 2012
- 522. The Stag Convergence
April 26, 2012
- 523. The Launch Acceleration
May 3, 2012
- 524. The Countdown Reflection
May 10, 2012
Season 4 24 episodes
- 401. The Robotic Manipulation
September 23, 2010
- 402. The Cruciferous Vegetable Amplification
September 30, 2010
- 403. The Zazzy Substitution
October 7, 2010
- 404. The Hot Troll Deviation
October 14, 2010
- 405. The Desperation Emanation
October 21, 2010
- 406. The Irish Pub Formulation
October 28, 2010
- 407. The Apology Insufficiency
November 4, 2010
- 408. The 21-Second Excitation
November 11, 2010
- 409. The Boyfriend Complexity
November 18, 2010
- 410. The Alien Parasite Hypothesis
December 9, 2010
- 411. The Justice League Recombination
December 16, 2010
- 412. The Bus Pants Utilization
January 6, 2011
- 413. The Love Car Displacement
January 20, 2011
- 414. The Thespian Catalyst
February 3, 2011
- 415. The Benefactor Factor
February 10, 2011
- 416. The Cohabitation Formulation
February 17, 2011
- 417. The Toast Derivation
February 24, 2011
- 418. The Prestidigitation Approximation
March 10, 2011
- 419. The Zarnecki Incursion
March 31, 2011
- 420. The Herb Garden Germination
April 7, 2011
- 421. The Agreement Dissection
April 28, 2011
- 422. The Wildebeest Implementation
May 5, 2011
- 423. The Engagement Reaction
May 12, 2011
- 424. The Roommate Transmogrification
May 19, 2011
Season 3 23 episodes
- 301. The Electric Can Opener Fluctuation
September 21, 2009
- 302. The Jiminy Conjecture
September 28, 2009
- 303. The Gothowitz Deviation
October 5, 2009
- 304. The Pirate Solution
October 12, 2009
- 305. The Creepy Candy Coating Corollary
October 19, 2009
- 306. The Cornhusker Vortex
November 2, 2009
- 307. The Guitarist Amplification
November 9, 2009
- 308. The Adhesive Duck Deficiency
November 16, 2009
- 309. The Vengeance Formulation
November 23, 2009
- 310. The Gorilla Experiment
December 7, 2009
- 311. The Maternal Congruence
December 14, 2009
- 312. The Psychic Vortex
January 11, 2010
- 313. The Bozeman Reaction
January 18, 2010
- 314. The Einstein Approximation
February 1, 2010
- 315. The Large Hadron Collision
February 8, 2010
- 316. The Excelsior Acquisition
March 1, 2010
- 317. The Precious Fragmentation
March 8, 2010
- 318. The Pants Alternative
March 22, 2010
- 319. The Wheaton Recurrence
April 12, 2010
- 320. The Spaghetti Catalyst
May 3, 2010
- 321. The Plimpton Stimulation
May 10, 2010
- 322. The Staircase Implementation
May 17, 2010
- 323. The Lunar Excitation
May 24, 2010
Season 2 23 episodes
- 201. The Bad Fish Paradigm
September 22, 2008
- 202. The Codpiece Topology
September 29, 2008
- 203. The Barbarian Sublimation
October 6, 2008
- 204. The Griffin Equivalency
October 13, 2008
- 205. The Euclid Alternative
October 20, 2008
- 206. The Cooper-Nowitzki Theorem
November 3, 2008
- 207. The Panty Pinata Polarization
November 10, 2008
- 208. The Lizard-Spock Expansion
November 17, 2008
- 209. The White Asparagus Triangulation
November 24, 2008
- 210. The Vartabedian Conundrum
December 8, 2008
- 211. The Bath Item Gift Hypothesis
December 15, 2008
- 212. The Killer Robot Instability
January 12, 2009
- 213. The Friendship Algorithm
January 19, 2009
- 214. The Financial Permeability
February 2, 2009
- 215. The Maternal Capacitance
February 9, 2009
- 216. The Cushion Saturation
March 2, 2009
- 217. The Terminator Decoupling
March 9, 2009
- 218. The Work Song Nanocluster
March 16, 2009
- 219. The Dead Hooker Juxtaposition
March 30, 2009
- 220. The Hofstadter Isotope
April 13, 2009
- 221. The Vegas Renormalization
April 27, 2009
- 222. The Classified Materials Turbulence
May 4, 2009
- 223. The Monopolar Expedition
May 11, 2009
Season 1 17 episodes
- 101. Pilot
September 24, 2007
- 102. The Big Bran Hypothesis
October 1, 2007
- 103. The Fuzzy Boots Corollary
October 8, 2007
- 104. The Luminous Fish Effect
October 15, 2007
- 105. The Hamburger Postulate
October 22, 2007
- 106. The Middle-Earth Paradigm
October 29, 2007
- 107. The Dumpling Paradox
November 5, 2007
- 108. The Grasshopper Experiment
November 12, 2007
- 109. The Cooper-Hofstadter Polarization
March 17, 2008
- 110. The Loobenfeld Decay
March 24, 2008
- 111. The Pancake Batter Anomaly
March 31, 2008
- 112. The Jerusalem Duality
April 14, 2008
- 113. The Bat Jar Conjecture
April 21, 2008
- 114. The Nerdvana Annihilation
April 28, 2008
- 115. The Pork Chop Indeterminacy
May 5, 2008
- 116. The Peanut Reaction
May 12, 2008
- 117. The Tangerine Factor
May 19, 2008