Big Bang Theory: The Bakersfield Expedition

"The Cooper/Kripke Inversion" is the thirteenth episode of season six of the comedy series The Big Bang Theory and the 126th episode of the series overall. It was directed by Mark Cendrowski and written by Steven Molaro, Jim Reynolds and Steve Holland based on a story treatment by Chuck Lorre, Eric Kaplan and Anthony Del Broccolo. The episode first aired on CBS on Thursday, January 10th, 2013.