The Big Bang Theory

The Hofstadter Isotope

E20    Apr 13, 2009    20m    TV-PG
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A fellow comic book enthusiast's hitting on Penny leads to Leonard and Howard going to a bar's Ladies' Night.
Where to Watch The Hofstadter Isotope
Cast of The Hofstadter Isotope
  • Johnny GaleckiLeonard Hofstadter
  • Jim ParsonsSheldon Cooper
  • Kaley CuocoPenny
  • Simon HelbergHoward Wolowitz
  • Kunal NayyarRajesh Koothrappali
  • Kevin SussmanStuart Bloom

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