The Big Bang Theory Season 1 Episode 14 : The Nerdvana Annihilation

When delivery of another collectible leads to Penny's lashing out at Leonard, he decides it's time to give up his habit, much to his friends' protestation.

NameThe Big Bang Theory Season 1 : The Nerdvana Annihilation
Air DateApril 28th, 2008
Production CompaniesChuck Lorre Productions, Warner Bros. Television
DirectorMark Cendrowski
Guest StarAndrew Walker
Plot Keywordsnerd, geek, friends, scientist, science, sitcom