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The Big Bang Theory S12E15 poster

Watch The Big Bang Theory – Season 12 Episode 15: The Donation Oscillation

The Big Bang Theory • Season 12, Episode 15 • 22 min • 2007 • ⭐ 7.9/10 • Comedy

Cast: Jim Parsons , Kaley Cuoco , Johnny Galecki , Simon Helberg , Kunal Nayyar , Melissa Rauch , Mayim Bialik

Directors: Chuck Lorre , Bill Prady

Watch The Big Bang Theory – S12E15

Episode Overview

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 Navigation

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Unraveling the Mystery: A Big Bang Farewell

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