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 Beverly Guest Star Pamela Adlon Halley Guest Star Chasty Ballesteros Karen Guest Star Jason Kravits Danny Guest Star Andre Boyer Kwame Guest Star Ben Rauch Darren Guest Star Chuck Lorre Executive Producer, Writer Bill Prady Executive Producer Steven Molaro Executive Producer, Writer Eric Kaplan Writer Steve Holland Writer Maria Ferrari Writer Jeremy Howe Writer Mark Cendrowski Director