Johnny Galecki Leonard Hofstadter Actor Jim Parsons Sheldon Cooper Actor Kaley Cuoco Penny Actor Simon Helberg Howard Wolowitz Actor Kunal Nayyar Raj Koothrappali Actor Melissa Rauch Bernadette Rostenkowski Guest Star Mayim Bialik Amy Farrah Fowler Guest Star Aarti Mann Priya Koothrappali Guest Star Arnold Chun Ho-Jun Guest Star Jeff Blum Waiter Guest Star Tom Yi Dispatcher Guest Voice Chuck Lorre Executive Producer, Writer Bill Prady Executive Producer, Writer David Goetsch Writer Eddie Gorodetsky Writer Steven Molaro Writer Eric Kaplan Writer Mark Cendrowski Director