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 Joshua Malina President Siebert Guest Star Lauren Lapkus Denise Guest Star Rati Gupta Anu Guest Star Hira Ambrosino Cynthia Guest Star Chuck Lorre Executive Producer Bill Prady Executive Producer Steven Molaro Executive Producer Maria Ferrari Writer Tara Hernandez Writer Adam Faberman Writer Steve Holland Writer Eric Kaplan Writer Anthony Del Broccolo Writer Mark Cendrowski Director