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The Big Bang Theory S2E20 — The Hofstadter Isotope
7.8
The Big Bang Theory•Season 2•Episode 20

The Hofstadter Isotope

7.8/10 · 4,860 votesApr 13, 200920 min

Ranked #22 of 23 in Season 2•−0.4 vs season avg

Discussion

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

Directed byMark Cendrowski
Written byDavid Goetsch
Previous episodeE19 · The Dead Hooker JuxtapositionNext episodeE21 · The Vegas Renormalization
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Cast5

Johnny Galecki

Johnny Galecki

Leonard Hofstadter

Jim Parsons

Jim Parsons

Sheldon Cooper

Kaley Cuoco

Kaley Cuoco

Penny

Simon Helberg

Simon Helberg

Howard Wolowitz

Kunal Nayyar

Kunal Nayyar

Rajesh Koothrappali

Crew2

Mark Cendrowski

Mark Cendrowski

Director

David Goetsch

David Goetsch

Writer

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Episode Summary

"The Hofstadter Isotope" is episode 20 of The Big Bang Theory season 2. It scored 7.8/10 from 4,860 votes, ranking #22 of 23 episodes this season (season average 8.2). Directed by Mark Cendrowski and written by David Goetsch, it aired on April 13, 2009.

Next: E21 · The Vegas RenormalizationBest of Season 2