Big Bang Theory cast now and then

Mayim Bialik as Amy Farrah Fowler

Kate Micucci as Lucy

Sara Gilbert as Leslie Winkle

Melissa Ivy Rauch as Bernadette Rostenkowski-Wolowitz

Kunal Nayyar as Rajesh Koothrappali

John Ross Bowie as Barry Kripke

Simon Helberg as Howard Wolowitz

Sara Rue as Stephanie Barnett

Christine Baranski as Dr. Hofstadter

Jim Parsons as Sheldon Cooper

Johnny Galecki as Leonard Hofstadter

Kaley Cuoco as Penny Hofstadter

Kevin Sussman as Stuart Bloom