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 Mark Berry Pit Boss Guest Star Evan Charest Croupier Guest Star D'Kia Anderson Hostess Guest Star Seth Coltan Earl Guest Star Chuck Lorre Executive Producer Bill Prady Executive Producer Steven Molaro Executive Producer David Goetsch Writer Maria Ferrari Writer Tara Hernandez Writer Steve Holland Writer Eric Kaplan Writer Jeremy Howe Writer Nicole Lorre Director