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 Laura Spencer Emily Sweeney Guest Star Craig Welzbacher Candidate 1 Guest Star Kurt Koehler Candidate 2 Guest Star Arshad Aslam Candidate 3 Guest Star Chuck Lorre Executive Producer, Writer Bill Prady Executive Producer Steven Molaro Executive Producer, Writer Steve Holland Writer Eric Kaplan Writer Maria Ferrari Writer Tara Hernandez Writer Mark Cendrowski Director