Ran: One season, 1976-1977
That's right: NBC made a police drama out of the 1973 Al Pacino movie, in which the actor played real-life honest cop Frank Serpico. For 14 episodes, a bearded David Birney ferreted out corrupt officers and busted bribers in the NYPD while still finding time to ride his motorcycle around Manhattan, looking very moody. Elmer Bernstein's theme music actually is a great mid-Seventies jam (how has no one sampled this yet?), but otherwise, this is less a cop show than a cop-out.
Success rate: 2