2x20 The Hofstadter Isotope - The Big Bang Theory Episode Guide

The Big Bang Theory

- Episode 02x20

Episode: 02x20
Title: The Hofstadter Isotope
Type: Regular Episode
Production Code: 220
First Aired: Apr. 13, 2009

Season 2 » Episode #20 - The Hofstadter Isotope

The Big Bang Theory - 02x20 The Hofstadter Isotope

Summary: While at a comic book store, Penny is romanced by a friend of the guys'. Meanwhile, Leonard and Wolowitz head to a bar for ladies night in hope of finding women.

Watch Episode Videos

Experiments (02:20)

Hypotheses (01:50)

Science on Set (01:39)

Shopping for Penny (01:50)

Who appeared in this episode?

Guest Stars:

Leonard Hofstadter	played by Johnny Galecki
Rajesh Koothrappali	played by Kunal Nayyar
Stuart	played by Kevin Sussman

Episode Quotes

	Season 2 / Episode 20: - The Hofstadter Isotope Sheldon Cooper: [Penny is asleep] Don't wake her. She'll maul you like a rabid wolverine.
	Season 2 / Episode 20: - The Hofstadter Isotope Stuart: Look Sheldon, it's late, I've gotta get some sleep. Sheldon Cooper: So I win. Stuart: No, I'm tired. Sheldon Cooper: So I win. Stuart: Fine, you win. Sheldon Cooper: Darn tootin' I win.