Johnny Galecki Leonard Hofstadter Actor Jim Parsons Sheldon Cooper Actor Kaley Cuoco Penny Actor Simon Helberg Howard Wolowitz Actor Kunal Nayyar Raj Koothrappali Actor Mayim Bialik Amy Farrah Fowler Actor Melissa Rauch Bernadette Rostenkowski Actor Kevin Sussman Stuart Guest Star Christine Baranski Beverly Guest Star Lauren Lapkus Denise Guest Star Rati Gupta Anu Guest Star Todd Giebenhain Mitch Guest Star Chuck Lorre Executive Producer Bill Prady Executive Producer Steven Molaro Executive Producer Steve Holland Writer Eric Kaplan Writer Jeremy Howe Writer Maria Ferrari Writer Andrew Gordon Writer Anthony Del Broccolo Writer Kristy Cecil Director