(S12EP12) Penny's ex-boyfriend, Zack, and his wife want a baby, but when Zack is infertile, they ask Leonard for help. Koothrappali attempts to mend things with his ex-fiancée, Anu.

Avec :
Mayim Bialik (Amy)
Johnny Galecki (Leonard)
Jim Parsons (Sheldon)
Kaley Cuoco (Penny)
Melissa Rauch (Bernadette)
Simon Helberg (Wolowitz)
Kunal Nayyar (Koothrappali)

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