The Hofstadter Isotope

A fellow comic book enthusiast hits on Penny which leads to Leonard, Raj, and Howard going to a bar on Ladies' Night.

Season 2 | Episode 20


Jim Parsons

as Sheldon Cooper

Johnny Galecki

as Leonard Hofstadter

Kaley Cuoco

as Penny

Simon Helberg

as Howard Wolowitz

Kunal Nayyar

as Raj Koothrappali