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The Big Bang Theory: Season12 | Episode12
The Propagation Proposition
Penny’s ex-boyfriend, Zack, and his wife want a baby, but when Zack is infertile, they ask Leonard for help. Also, Koothrappali attempts to mend things with his ex-fiancée, Anu.
S12 - E1The Conjugal Configuration Sep. 24, 2018
S12 - E2The Wedding Gift Wormhole Sep. 27, 2018
S12 - E3The Procreation Calculation Oct. 04, 2018
S12 - E4The Tam Turbulence Oct. 11, 2018
S12 - E5The Planetarium Collision Oct. 18, 2018
S12 - E6The Imitation Perturbation Oct. 25, 2018
S12 - E7The Grant Allocation Derivation Nov. 01, 2018
S12 - E8The Consummation Deviation Nov. 08, 2018
S12 - E9The Citation Negation Nov. 15, 2018
S12 - E10The VCR Illumination Dec. 06, 2018
S12 - E11The Paintball Scattering Jan. 03, 2019
S12 - E12The Propagation Proposition Jan. 10, 2019
S12 - E13The Confirmation Polarization Jan. 17, 2019
S12 - E14The Meteorite Manifestation Jan. 31, 2019
S12 - E15The Donation Oscillation Feb. 07, 2019
S12 - E16The D & D Vortex Feb. 21, 2019
S12 - E17The Conference Valuation Mar. 07, 2019
S12 - E18The Laureate Accumulation Apr. 04, 2019
S12 - E19The Inspiration Deprivation Apr. 18, 2019
S12 - E20The Decision Reverberation Apr. 25, 2019
S12 - E21The Plagiarism Schism May. 02, 2019
S12 - E22The Maternal Conclusion May. 09, 2019
S12 - E23The Change Constant / The Stockholm Syndrome May. 16, 2019
S12 - E24Unraveling the Mystery: A Big Bang Farewell May. 16, 2019