Ran: Five seasons and counting, 2010-Present
Ironically, Ron Howard's 1989 comedy about the ups and downs of a large, extended family named the Buckmans felt like a network sitcom that just happened to be shown in theaters. An early attempt to adapt it in 1990 went bust after a single season (Leonardo DiCaprio was in the cast; Joss Whedon was one of the writers), but a second try hit paydirt: Now renamed the Bravermans, the new Parenthood's multigenerational clan bicker, banter, cry, giggle, deal with a child with Aspergers syndrome and get on each other's nerves. Nothing new in that, except that the cast (which includes Coach's Craig T. Nelson, Six Feet Under's Peter Krause and Gilmore Girls' mighty Lauren Graham) and the writers have managed to do it way that feels surprisingly unsuperficial for a primetime drama. It took turning this into a TV show to take the TV-ness out of it.
Success rate: 7