The Big Bang Theory
The Donation Oscillation still

S12E15

The Donation Oscillation

Aired February 7, 2019

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Summary

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 aboard the "vomit comet."

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