Season 1 Episode 6: The Middle Earth Paradigm

 Season 1 Episode 6: The Middle Earth Paradigm

 Season 1 Episode 6: The Middle Earth Paradigm

Season 1 Episode 6: The Middle Earth Paradigm

Season 1 Episode 6 "The Middle Earth Paradigm" aired 10/29/2007. Penny hosts a Halloween party, putting Leonard, Sheldon, Wolowitz, and Koothrappali through a new test of their social skills.