A legendary Ultraman from the Land of Light, King was alive before the creation of the Plasma Spark. He is extremely powerful in the appearances he has made, showing he is able to bring Ultraman Leo back to life after he'd been sawed to pieces by Black Directive without any effort. His age was revealed to be 300,000 years in the 2003 movie New Century 2003 Ultraman Legend: THE KING'S JUBILEE, but the chronological order of this work is unclear.
Despite not making a major appearance, he briefly appeared in the end of the movie, returning to the Land of Light along with the Inter Galactic Defense Force after Belial's army have been defeated. Ultraman Zero The Movie: Super Deciding Fight! The Belial Galactic Empire
Despite not making a real appearance in this movie, he was seen in a flashback along with Ultraman Leo and Astra. However, sometime before the movie, Ultraman King created the Ultra Fusion Brace. He entrusted it to Zero to go to Earth in order to pass it to Hikaru. Ultraman Ginga S The Movie: Showdown! The 10 Ultra Warriors! 153554b96e