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 Yeardley Smith Sandy Guest Star Kevin Brief Glen Guest Star Chuck Lorre Executive Producer, Writer Bill Prady Executive Producer Lee Aronsohn Writer David Goetsch Writer Steve Holland Writer Steven Molaro Writer Eric Kaplan Writer Mark Cendrowski Director