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 Brian Posehn Bert Guest Star Lauren Lapkus Denise Guest Star Andrew Daly Nathan Guest Star Joel McCrary Andy Guest Star Minerva García Linda Guest Star Chuck Lorre Executive Producer, Writer Bill Prady Executive Producer Steven Molaro Executive Producer Steve Holland Writer Maria Ferrari Writer Eric Kaplan Writer Tara Hernandez Writer Jeremy Howe Writer Mark Cendrowski Director