Johnny Galecki Leonard Hofstadter Actor Jim Parsons Sheldon Cooper Actor Simon Helberg Howard Wolowitz Actor Kunal Nayyar Raj Koothrappali Actor Kaley Cuoco Penny Actor Sarayu Blue Lalita Gupta Guest Star Brian George Dr. V.M. Koothrappali Guest Star Alice Amter Mrs. Koothrappali Guest Star Chuck Lorre Executive Producer Bill Prady Executive Producer David Goetsch Writer Steven Molaro Writer Lee Aronsohn Writer Robert Cohen Writer Ted Wass Director