All the seasons of The Big Bang Theory were great, but which seasons really stand out? After introducing viewers to Leonard, Sheldon, Penny, and their friends in season one, the series focuses on the relationships and research of the characters in later seasons, finally coming to an end with season 12 in 2019. Some of the most memorable episodes of The Big Bang Theory come from different seasons, so picking the top season isn't easy. To determine once and for all what the best seasons of The Big Bang Theory are, let's rank every The Big Bang Theory season from best to worst.
The Big Bang Theory is a comedy sitcom series that aired on CBS from 2007 to 2019. It was created by Chuck Lorre and Bill Prady and features an all-star cast including Johnny Galecki, Jim Parsons, and Kaley Cuoco. Parsons won an Emmy for Best Actor in a Comedy Series multiple times for his work as Sheldon Cooper. The show even spawned a prequel spin-off, Young Sheldon, continuing the story while adding background to the characters.
Vote up your favorite seasons of The Big Bang Theory, and vote down any bad seasons that you really didn't enjoy, despite how much you loved any individual episodes. It can be painful to put one The Big Bang Theory season over the other when there are so many good ones, which is why you can vote on however many seasons you like.
The second season of The Big Bang Theory premiered on September 22, 2008 and contains 23 episodes. This season finds Penny becoming more intertwined in the world of Leonard and Sheldon.
This season features several unforgettable episodes including: "The Codpiece Topology," "The Cooper–Nowitzki Theorem," and "The Cushion Saturation."
Memorable moments from Season 2 include:
- Sheldon and Raj play rock, paper, scissors, lizard, Spock.
- Penny gives Sheldon the perfect Christmas gift.
- The guys go on an expedition to the North Pole.
The third season of The Big Bang Theory premiered on September 21, 2009, and contains 23 episodes. This season Penny and Leonard rekindle their romance as Sheldon finds an arch enemy in Wil Wheaton.
This season features several unforgettable episodes including: "The Jiminy Conjecture," "The Wheaton Recurrence," and "The Lunar Excitation."
Memorable moments from Season 3 include:
- Howard starts dating Bernadette.
- Sheldon meets Amy.
- Penny and Leonard split up.
The first season of The Big Bang Theory premiered on September 24, 2007, and contains 17 episodes. This season introduces viewers to the show's brainy main characters, Sheldon and Leonard, and their next door neighbor, Penny.
This season features several unforgettable episodes including: "Pilot," "The Pancake Batter Anomaly," and "The Tangerine Factor."
Memorable moments from Season 1 include:
- Sheldon loses his job.
- Raj learns the secret to talking to women.
- Penny and Leonard go on a date.
The fourth season of The Big Bang Theory premiered on September 23, 2010, and contains 24 episodes. This season Penny and Amy develop a friendship and Howard and Bernadette take their relationship to the next level.
This season features several unforgettable episodes including: "The Love Car Displacement," "The Toast Derivation," and "The Roommate Transmogrification."
Memorable moments from Season 4 include:
- Howard asks Bernadette to marry him.
- Shelbot is invented.
- Penny wakes up with Raj.