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The Big Bang Theory S2E20 poster

Watch The Big Bang Theory – Season 2 Episode 20: The Hofstadter Isotope

The Big Bang Theory • Season 2, Episode 20 • 20 min • 2007 • ⭐ 7.9/10 • Comedy

Cast: Jim Parsons , Kaley Cuoco , Johnny Galecki , Simon Helberg , Kunal Nayyar , Melissa Rauch , Mayim Bialik

Directors: Chuck Lorre , Bill Prady

Watch The Big Bang Theory – S2E20

Episode Overview

A fellow comic book enthusiast's hitting on Penny leads to Leonard and Howard going to a bar's Ladies' Night.

Episode Navigation

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