Nicktoons are the collective term for animated series produced by Nickelodeon Productions and aired on Nickelodeon. During the 1980's, the animated programming on the network was all made up of acquired series. During the 2000's Nickelodeon has returned to airing non-original programming, mostly Japanese anime series and Teletoon shows, alongside their own shows.
Most of these series have been re-broadcast on Nickelodeon's sister network Nicktoons, which also air original, imported, series, as well as other acquired series. So far, only one original, Nickelodeon produced, animated series have premiered on the Nicktoons network: Random! Cartoons.