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 Tania Raymonde Yvette Guest Star Eric Petersen Eric Guest Star Alex Ball Waiter Guest Star Chuck Lorre Executive Producer Bill Prady Executive Producer Steven Molaro Executive Producer, Writer Jim Reynolds Writer Steve Holland Writer Tara Hernandez Writer Eric Kaplan Writer Maria Ferrari Writer Mark Cendrowski Director