Ultraman Protects the Shadow of History

I traveled to the world of Ultraman, but the development of the timeline here seemed a little different. I kept entering the world of different Ultraman to fight against enemies in the dark. In order not to affect the development of the main line of history too much, I chose to become a "shadow" guarding the world in the dark, contacting the protagonists and exchanging information, providing help, discovering and hindering the enemy's conspiracy.