Guest Star: Max Alder

• 

  The Intimacy Acceleration
  Season 8, Episode 16 - Aired February 26, 2015

  After Amy mentions an experiment which aimed to see whether people could fall in love in just a few hours, Sheldon and Penny volunteer to perform the experiment themselves. Sheldon and Penny spend the evening sharing intimate details about themselves.

  Meanwhile, Leonard, Amy, Raj and Emily visit an "escape room" where they are tormented by a zombie, but their intellect threatens to ruin their fun. Meanwhile, Howard and Bernadette encounter trouble as they fly back from Mrs. Wolowitz's funeral.

  Appeared as Zombie