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Season 12 Episode
- Season 12 The Conjugal Configuration
- Season 12 The Wedding Gift Wormhole
- Season 12 The Procreation Calculation
- Season 12 The Tam Turbulence
- Season 12 The Planetarium Collision
- Season 12 The Imitation Perturbation
- Season 12 The Grant Allocation Derivation
- Season 12 The Consummation Deviation
- Season 12 The Citation Negation
- Season 12 The VCR Illumination
- Season 12 The Paintball Scattering
- Season 12 The Propagation Proposition
- Season 12 The Confirmation Polarization
- Season 12 The Meteorite Manifestation
- Season 12 The Donation Oscillation
- Season 12 The D & D Vortex
- Season 12 The Conference Valuation
- Season 12 The Laureate Accumulation
- Season 12 The Inspiration Deprivation
- Season 12 The Decision Reverberation
- Season 12 The Plagiarism Schism
- Season 12 The Maternal Conclusion
- Season 12 The Change Constant / The Stockholm Syndrome
- Season 12 Unraveling the Mystery: A Big Bang Farewell
The Big Bang Theory - Season 12 Episode 12 The Propagation Proposition
7.90 22 minutes 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.
