The Separation Oscillation Season: 9 Episode: 2 Air Date: 2015-09-28
GUEST STARS: Melissa Tang
Leonard confronts the woman he kissed on the North Sea in an attempt to set Penny's mind at ease. Also, Sheldon films a special episode of "Fun with Flags" after his breakup with Amy, and Bernadette feels guilty about withholding a secret from Penny.