Johnny Galecki Leonard Hofstadter Actor Jim Parsons Sheldon Cooper Actor Kaley Cuoco Penny Actor Simon Helberg Howard Wolowitz Actor Kunal Nayyar Raj Koothrappali Actor Mayim Bialik Amy Farrah Fowler Actor Melissa Rauch Bernadette Rostenkowski Actor Kevin Sussman Stuart Guest Star Carol Ann Susi Debbie Wolowitz Guest Voice Stephen Root Dan Guest Star David Barrera Officer Hernandez Guest Star Anil Margsahayam Man Guest Star Tonja Kahlens Woman Guest Star Chuck Lorre Executive Producer Bill Prady Executive Producer Steven Molaro Executive Producer, Writer Jim Reynolds Writer Maria Ferrari Writer Tara Hernandez Writer Steve Holland Writer Eric Kaplan Writer Mark Cendrowski Director