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 Laura Spencer Emily Sweeney Guest Star Stephanie Escajeda Cindy Guest Star Molly Morgan Hostess Guest Star Max Alder Zombie Guest Star Chuck Lorre Executive Producer Bill Prady Executive Producer Steven Molaro Executive Producer David Goetsch Writer Eric Kaplan Writer Tara Hernandez Writer Steve Molaro Writer Jim Reynolds Writer Steve Holland Writer Mark Cendrowski Director