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 Laura Spencer Emily Sweeney Guest Star Kara Luiz Jeanie Guest Star Chuck Lorre Executive Producer Bill Prady Executive Producer Steven Molaro Executive Producer Jim Reynolds Writer Steve Holland Writer Jeremy Howe Writer Steve Molaro Writer Eric Kaplan Writer Maria Ferrari Writer Mark Cendrowski Director