Tripper Posted December 26, 2018 Posted December 26, 2018 The Propagation Proposition Airs Thursday, January 10 at 8/7c on CBS Penny's ex-boyfriend, Zack (Brian Thomas Smith), 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. Share this post Link to post Share on other sites More sharing options...
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