The Hofstadter Isotope S20E20 - The Hofstadter Isotope 2009
A fellow comic book enthusiast's hitting on Penny leads to Leonard and Howard going to a bar's Ladies' Night.
- Released: 2009-04-13
- Runtime: 50 minutes
- Genre:
- Stars: Johnny Galecki, Jim Parsons, Kaley Cuoco, Simon Helberg, Kunal Nayyar
- Director: Mark Cendrowski