Clarissa Explains It All was an American situation comedy television series from Nickelodeon starring a then unknown Melissa Joan Hart. Sixty-five episodes were shown during the five seasons. The teen sitcom ran from March 1, 1991 to December 3, 1994. In the series, Clarissa, a teenager, breaks the fourth wall and describes the things that are happening in her life (dealing with typical teen concerns such as school, pimples and an aggravating little brother) to her television audience.