Ultraman Tregear is an Ultraman who made his first appearance in Ultraman R/B The Movie as the main antagonist. He later becomes the main antagonist of the succeeding series, Ultraman Taiga. He was once Ultraman Taro's friend and a scientist on the Land of Light who created the Taiga Spark, but several disappointments and obstacles drove him down a dark path.
Tregear reappeared as the arch-nemesis of Ultraman Taiga and relentlessly targets him. While hunting down Taiga on Earth, he assumes the form of a man named Kirisaki, who calls down monsters such as Hellberus to do his bidding. Buddy Go! He personally attacks Taiga simply to spite him and his human host Hiroyuki Kudo after Hiroyuki's former pet Guesra Chibisuke was spotted in Japanese waters. Tregear kills Chibisuke to further enrage Hiroyuki, before taking his leave. Tregear Tregear also turns Rento Kujo into his puppet to cause destruction as Galactron MK2, and hinders Ultraman Titas upon his return. Avenger of the Star Other than that, Tregear takes the chance to taunt and meddle with Ultraman Fuma after Darebolic (MB) is destroyed.