The Big Bang Theory Season 12 Episode 15: The Donation Oscillation
First aired on Feb. 7, 2019
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Penny tries to seduce an abstaining Leonard to ruin his "donation" for her ex-boyfriend, Zack, and his wife, Marissa. Also, Wolowitz, Bernadette, Anu and Koothrappali turn Koothrappali's canceled bachelor party into a couple's trip.
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