The Big Bang Theory: The 19 Best Episodes of All Time!

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The Big Bang Theory may be coming to an end after 12 seasons, but the record-smashing and also controversial comedy series will leave fans with countless episodes to watch and rewatch.

But which episodes are the very best?

Everyone has their own opinions on which episodes are the best, but we took a look at how the episodes are rated on IMDB to figure out which are the most beloved by fans.

There are a lot of holiday episodes.

Also, a lot of episodes with the word "excitation" in the title. Mere correlation or is there a causal factor?

Take a look at 19 of the very best episodes of this legendary series -- and get excited about your next rewatch!

19. The 43 Peculiarity

The 43 Peculiarity
Season 6, Episode 8 -- Leonard is jealous of Penny's flirty new study partner while Raj and Wolowitz investigate where Sheldon keeps disappearing to while muttering "43"

18. The Middle Earth Paradigm

The Middle Earth Paradigm
Season 1, Episode 6 -- Penny invites the guys to her Halloween party, where she and Leonard share an early moment. Meanwhile, Sheldon's doppler effect costume goes unappreciated.

17. The Roommate Transmogrification

The Roommate Transmogrification
Season 4, Episode 24 -- Leonard and Priya's romantic escapades prompt Raj to move in with Sheldon, and it turns out that they get along just fine. Raj gets along a little TOO well with Penny.

16. The Lunar Excitation

The Lunar Excitation
Season 3, Episode 23 -- Penny discovers that her time with Leonard has made her less interested in dumb men, leaving her to have an odd encounter with Leonard. Sheldon also gets a dating profile, but it was not his idea. Side note: this is just one of many "excitation" titles on this list.

15. The Vegas Renormalization

The Vegas Renormalization
Season 2, Episode 21 -- The B Story is that Sheldon gets locked out of his apartment, which seems unlikely but leads to him sort of bonding with Penny. The A Story is that Raj and Leonard take Wolowitz to Las Vegas to cheer him up after his breakup with Leslie.

14. The Hawking Excitation

The Hawking Excitation
Season 5, Episode 21 -- Wolowitz torments Sheldon, who idolizes Stephen Hawking, by making him run a proverbial gauntlet before he can meet the famed theoretical astrophysicist. Petty is as petty does.

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