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 Danica McKellar Abby Guest Star Jen Drohan Martha Guest Star David Trice Waiter Guest Star Chuck Lorre Executive Producer, Writer Bill Prady Executive Producer Lee Aronsohn Writer Steven Molaro Writer Eric Kaplan Writer Jim Reynolds Writer Mark Cendrowski Director