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 Iain Armitage Young Sheldon Guest Star Lance Barber George Sr. Guest Star Montana Jordan Georgie Guest Star Kurt Scholler Judge Guest Star Chuck Lorre Executive Producer Bill Prady Executive Producer, Writer Steven Molaro Executive Producer, Writer Steve Holland Writer Maria Ferrari Writer Andrew Gordon Writer Jeremy Howe Writer Mark Cendrowski Director