Physicists Leonard and Sheldon find their nerd-centric social circle with pals Howard and Raj expanding when aspiring actress Penny moves in next door.
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Johnny Galecki
Leonard Hofstadter
Jim Parsons
Sheldon Cooper
Kaley Cuoco
Penny
Simon Helberg
Howard Wolowitz
Kunal Nayyar
Rajesh Koothrappali
Melissa Rauch
Bernadette Rostenkowski
Mayim Bialik
Amy Farrah Fowler