The Big Bang Theory Season 12 Episode 15
Season 12
Episode: 15
Air Date: 2019-02-07
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…
Episode Title: The Donation Oscillation
