Leonard Hofstadter and Sheldon Cooper are both brilliant physicists working at Cal Tech in Pasadena, California. They are colleagues, best friends, and roommates, although in all capacities their relationship is always tested primarily by Sheldon's regimented, deeply eccentric, and non-conventional ways. They are also friends with their Cal Tech colleagues mechanical engineer Howard Wolowitz and astrophysicist Rajesh Koothrappali. The foursome spend their time working on their individual work projects, playing video games, watching science-fiction movies, or reading comic books. As they are self-professed nerds, all have little or no luck with women. When Penny, a pretty woman and an aspiring actress from Omaha, moves into the apartment across the hall from Leonard and Sheldon's, Leonard has another aspiration in life, namely to get Penny to be his girlfriend.
Smart Is The New Sexy.
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Did You Know?
In early episodes of season one, Sheldon (Jim Parsons
) mentions having an older brother, in addition to his twin sister, Missy (Courtney Henggeler
). In one instance, he mentions being bullied by this older brother. However, while Missy has been seen on the show, the brother was never mentioned again, even when his mother (played by Laurie Metcalff) visits. She only mentions Missy. He was mentioned in season three episode four, The Big Bang Theory: The Pirate Solution
(2009), as well. In later seasons, Sheldon's brother was mentioned in season seven episode eleven, The Big Bang Theory: The Cooper Extraction
(2013), season eight episode twenty, The Big Bang Theory: The Fortification Implementation
(2015), season eight episode twenty-three, The Big Bang Theory: The Maternal Combustion
(2015), and season nine episode five, The Big Bang Theory: The Perspiration Implementation
(2015). Sheldon's older brother is shown in the Big Bang Theory spin-off, Young Sheldon
(2017). See more
Sheldon's trademark knock (3 knocks + name, 3 knocks + name, 3 knocks + name) was not established until later in the first season, however, in a scene that pre-dates the start of the show, he is shown doing that knock sequence. See more
[repeated line when someone accuses Sheldon of being crazy
I'm not crazy. My mother had me tested!
One of the final cards to appear in the credit sequence is the vanity card for Chuck Lorre Productions. In keeping with his practice on "Dharma and Greg" and "Two and a Half Men", there is a different message on the card each week, written by Chuck Lorre himself. See more
History of Everything (Instrumental)
Composed by Barenaked Ladies
Performed by Barenaked Ladies
Played during the end credits See more