Season 4

Director Anthony Rich joins host Jessica Radloff to discuss the additions of Amy Farrah Fowler and Bernadette Rostenkowski to the core cast.

Kunal Nayyar breaks down Raj's Season 4 journey, from his bromance with Howard to Raj's unrequited feelings for Bernadette.

Mayim Bialik joins Jessica Radloff to look back on her first season as Amy Farrah Fowler on "The Big Bang Theory."

Brian Thomas Smith joins Jessica Radloff to revisit his nine-season run as Zack Johnson, Penny's lovable but hilariously clueless boyfriend.

Melissa Rauch looks back on the season that changed everything as Bernadette became a series regular on "The Big Bang Theory."

Simon Helberg reflects on the magic of "The Big Bang Theory" and the incredible way the show connected people around the world.

E/P and showrunner Steve Holland joins Jessica Radloff to look back at how "The Big Bang Theory" evolved into one of TV's most memorable ensembles.

Josh Malina joins Jessica Radloff to look back at his recurring role as President Siebert and reveals he originally auditioned to play Lenoard!

Season four ended with Penny and Raj waking up in bed together. Steve Molaro reveals why he spent the hiatus trying to figure out a way to undo it.

"Young Sheldon" star Raegan Revord, aka Missy Cooper, takes a deep dive into the "Young Sheldon" Easter eggs hidden throughout "The Big Bang Theory."

Captain Sweatpants, one of "Big Bang's" most recognizable recurring characters, opens up about how a background role turned him into a fan favorite.