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 Rick Fox Glenn Guest Star Chuck Lorre Executive Producer, Writer Bill Prady Executive Producer, Writer David Goetsch Writer Lee Aronsohn Writer Steven Molaro Writer Steve Holland Writer Anthony Rich Director