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  1. Release dateSeptember 24, 2007 (USA)
    End year2019
    Content ratingTV-PG · TV-14
    GenreComedy · Romance
    Cast and characters

    Johnny Galecki as Leonard Hofstadter: An experimental physicist with an IQ of 173, who received his Ph.D. when he was 24 years old. Leonard is a nerd who loves video games, comic books, and Dungeons & Dragons. … See more

    Production

    The show's pilot episode premiered on September 24, 2007. This was the second pilot produced for the show. A different pilot was produced for the 2006–07 television season but never aired. The structure of the original una… See more

    Recurring themes and elements

    Much of the series focuses on science, particularly physics. The four main male characters are employed at Caltech and have science-related occupations, as do Bernadette and Amy. The characters frequently … See more

    Release

    The Big Bang Theory premiered in the United States on September 24, 2007, on CBS. The series debuted in Canada on CTV in September 2007. On February 14, 2008, the series debuted in the United Kingdom on channels … See more

     
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