The Big Bang Theory: The Separation Oscillation

Penny and Leonard are officially married, however, their honeymoon phase didn't last very long [...]

Penny and Leonard are officially married, however, their honeymoon phase didn't last very long once Penny found out that Leonard works with the woman he smooched with on the North Sea. On tonight's episode, we'll finally get to meet the mystery woman who has unknowingly come between Leonard and Penny's happiness.

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.

Check out the sneak peeks in the videos below.

"The Separation Oscillation" episode of The Big Bang Theory airs tonight, Sept. 28 (8:00-8:31 PM, ET/PT), on CBS.