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 Brian Posehn Bert Kibbler Guest Star Josh Peck Jesse Guest Star Ian Scott Rudolph Captain Sweatpants Guest Star Chuck Lorre Executive Producer Bill Prady Executive Producer Steven Molaro Executive Producer, Writer Eric Kaplan Writer Maria Ferrari Writer Tara Hernandez Writer Jim Reynolds Writer Steve Holland Writer Mark Cendrowski Director