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The Big Bang Theory Season 12 Episode 15

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.

Episode Title: The Donation Oscillation

Air Date: 2019-02-07

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