The sitcom is centered on five characters living in Pasadena, California: roommates Leonard Hofstadter and Sheldon Cooper; Penny, a waitress and aspiring actress who lives across the hall; and Leonard and Sheldon’s equally geeky and socially awkward friends and co-workers, mechanical engineer Howard Wolowitz and astrophysicist Raj Koothrappali. The geekiness and intellect of the four guys is contrasted for comic effect with Penny’s social skills and common sense.
Season 12 – Episode 24
Bernadette and Wolowitz leave their kids for the first time; Penny and Leonard try to keep a secret; Sheldon and Amy stick together; and Koothrappali makes a new friend, as the gang travels together into an uncharted future.
The episode was rated from 2611 votes.
#2 – The Bath Item Gift Hypothesis
Season 2 – Episode 11
Penny starts dating Leonard’s handsome colleague; Leonard and his friends are tortured by Sheldon’s obsession with gift-giving etiquette.
The episode was rated from 3055 votes.
#3 – The Thanksgiving Decoupling
Season 7 – Episode 9
An upset Sheldon protests when the entire gang drags him to Mrs. Wolowitz’s house for Thanksgiving. Meanwhile, Penny and Leonard must deal with a mistake from her past.
The episode was rated from 4911 votes.
#4 – The Change Constant
Season 12 – Episode 23
Sheldon and Amy await big news.
The episode was rated from 3277 votes.
#5 – The Roommate Transmogrification
Season 4 – Episode 24
When Bernadette receives her PhD, Wolowitz feels emasculated. Raj and Leonard swap apartments and Penny does something she regrets.
The episode was rated from 2726 votes.
#6 – The Countdown Reflection
Season 5 – Episode 24
As Howard’s mission to space approaches, Howard and Bernadette decide to get married before his launch, causing the gang to scurry into overdrive in an effort to stage the wedding.
The episode was rated from 2906 votes.
#7 – The Good Guy Fluctuation
Season 5 – Episode 7
A cute comic book artist puts Leonard and Priya’s relationship to the test, while Sheldon tries to scare the guys for Halloween.
The episode was rated from 3195 votes.
#8 – The Lunar Excitation
Season 3 – Episode 23
While Penny worries that dating Leonard has ruined her for normal guys, Wolowitz and Koothrappali search for Sheldon’s perfect match online.
The episode was rated from 2702 votes.
#9 – The Scavenger Vortex
Season 7 – Episode 3
When the entire gang competes in a cutthroat scavenger hunt designed by Raj that tests their science knowledge and street smarts, it brings out the best – and worst – in everyone.
The episode was rated from 4987 votes.
#10 – The Hawking Excitation
Season 5 – Episode 21
When Wolowitz gets to work with Stephen Hawking, Sheldon is willing to do anything to meet his hero.
The episode was rated from 2931 votes.