The protagonist travels to the universe in a time period before Noah has appeared, and becomes a light particle that can only drift in the universe. In the universe, it absorbs all the light particles from Ultraman's battles in the time period when Noah arrived in the galaxy. After a long time, he was finally chased by Lujiael through time and space and was brought to the world of Nexus to grow into an Ultraman. He is Ultraman Galaxy Seth, a powerful warrior who can become any Ultraman!
