The Big Bang Theory Season 12 Episode 15
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.
Director: Mark Cendrowski
Guest Star: Brian Thomas Smith, Eric Nenninger, Keith Carradine, Lindsey Kraft, Rati Gupta