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What is The Big Bang Theory About?

The Big Bang Theory list of episodes
The Big Bang Theory
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.
The first episode of The Big Bang Theory aired on September 24, 2007 and the most recent episode to air was on May 16, 2019.