#21 Legends of the Superheroes
In 1979, The Green Lantern made his live-action debut. It was unfortunate that the debut occurred on the Super Friends spin-off, the Legends of the Superheroes variety show. While this moment may be more notable than "bright," a live-action debut is a milestone that most superheroes never achieve. Well done GL.
#25 - Justice League Unlimited: Initiation - John Stewart's new look
#24 - Batman: The Brave and the Bold: Death Race to Oblivion! - Guy Gardner's Lanternmobile
#23 - Justice League of America: Pilot - Doesn't air
#22 - Justice League Unlimited: The Once and Future Thing: Time Warped - Hal Jordan joins the league
#21 - Legends of the Superheroes - Lantern goes live-action