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 Christine Baranski Dr. Beverly Hofstadter Guest Star John Ross Bowie Barry Kripke Guest Star Sara Gilbert Leslie Winkle Guest Star Wil Wheaton Wil Wheaton Guest Star Adam West Adam West Guest Star Chuck Lorre Executive Producer, Writer Bill Prady Executive Producer Steven Molaro Executive Producer, Writer Eric Kaplan Writer Jeremy Howe Writer Steve Holland Writer Tara Hernandez Writer Mark Cendrowski Director