Johnny Galecki

(Leonard Hofstadter)

Jim Parsons

(Sheldon Cooper)

Kaley Cuoco-Sweeting

(Penny)

Simon Helberg

(Howard Wolowitz)

Kunal Nayyar

(Raj Koothrappali)

Mayim Bialik

(Amy Farrah Fowler)

Melissa Rauch

(Bernadette Rostenkowski)

Mike Massimino

(Mike Massimino)

Malcolm Foster Smith

(Roy)