Showrunner Steve Molaro joins for a deep dive into the highly anticipated Penny and Leonard romance that launched Season 3 of "Big Bang."

Director Anthony Rich shares what was going on behind the scenes during one of “The Big Bang Theory’s” most emotional storylines: Penny and Leonard’s breakup in Season 3. He shares how the timing of the characters’ split closely overlapped with Kaley Cuoco and Johnny Galecki’s real-life breakup, recalls a difficult day on set when Kaley became emotional, and reveals what he told her in that moment. Anthony also discusses the one part of Penny and Leonard’s breakup storyline that Kaley and Johnny both pushed back on — and why it mattered so much to them.