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 Laurie Metcalf Mary Guest Star John Ross Bowie Kripke Guest Star Wil Wheaton Himself Guest Star Brian Posehn Bert Guest Star Jerry O'Connell George Guest Star Courtney Henggeler Missy Guest Star Lauren Lapkus Denise Guest Star Teller Mr. Fowler Guest Star Kathy Bates Mrs. Fowler Guest Star Mark Hamill Himself Guest Star Chuck Lorre Executive Producer, Writer Bill Prady Executive Producer Steven Molaro Executive Producer, Writer Maria Ferrari Writer Steve Holland Writer Eric Kaplan Writer Tara Hernandez Writer Mark Cendrowski Director