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 Christine Baranski Beverly Guest Star Dana L. Wilson Dr. Samuel Guest Star Michael Patrick McGill Police Officer Guest Star Chuck Lorre Executive Producer Bill Prady Executive Producer, Writer Steven Molaro Executive Producer Maria Ferrari Writer Tara Hernandez Writer Steve Holland Writer Eric Kaplan Writer Jeremy Howe Writer Mark Cendrowski Director