Episode Titles: Complexity

 You are viewing a list of 1 The Big Bang Theory episode featuring "Complexity" in their title.

  • The Boyfriend Complexity

    Season 4, Episode 9 - The Boyfriend Complexity
    Aired November 18, 2010

    Penny's dad is in town and Leonard is confused when Penny starts acting romantic with him. Penny asks Leonard to lie to her father and pretend they are still in a relationship. Meanwhile, Howard, Raj and Bernadette spend the night monitoring a telescope in the astrophysics lab, but the night takes an awkward turn when Raj starts drinking.