TV show: Clarissa Explains It All (1991-94)

Melissa Joan Hart as Clarissa Darling, the always-explaining protagonist, was the originator of the Nick babe concept. Without Clarissa, 21 years ago, we might never have seen iCarly, Zoey 101, The Amanda Show, Victorious, and the rest of them. If Nickelodeon has (unintentionally) turned into a babe factory, Melissa Joan Hart was its Model T.