There are 111 episodes The Big Bang Theory season 1, season 2, season3, season4 and season 5. The Big Bang Theory season 1 episode list: Season 1, Episode 1 - Pilot Season 1, Episode 2 - The Big Bran Hypothesis Season 1, Episode 3 - The Fuzzy Boots Corollary Season 1, Episode 4 - The Luminous Fish Effect Season 1, Episode 5 - The Hamburger Postulate Season 1 ...