Guest Star: Eric Nenniger

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  The Donation Oscillation
  Season 12, Episode 15 - Aired February 7, 2019

  When Penny's father, Wyatt, comes to town, he reopens the debate over Penny not wanting kids and Leonard donating his sperm to Zack and Marissa.

  Meanwhile, Howard decides to keep the reservation for the "vomit comet" he originally made for Raj's planned bachelor party. Raj invites Anu and wants to turn it into a couples' trip, but Howard doesn't think Bernadette would enjoy it.

  Appeared as Neil