15,000 years ago, the M80 people built a clone of their patron god Ultraman Noa to defend themselves from Space Beasts. Unfortunately, Zagi was driven by darkness to he destroy his home planet.

Dark Lugiel and Ultraman Ginga were once a singular entity, but their paths diverged due to conflicting perspectives on lifeforms. They have engaged in perpetual fight across the timeline.

Dark Killer is an amalgamation of defeated monster spirits, fueled by Dark Energy, enabling his immortality. He duplicates the dark versions of Ultras, with their strength surpassing that of the originals.

It is responsible for the annihilation of the Ultra-Ancient civilizations that flourished millions of years ago by covering the world in perpetual darkness. It went hibernate once its purpose was fulfilled.

Gudis is a bcateria-like intellectual lifeform, capable of transforming into cellular units to infect other species. Every civilization it invades will either perish or variant in the form of a beast.

Gillvalis, an A.I. robot created to preserve peace of humans. However it arrived at the conclusion that the termination of all intelligent species is the sole method to establish eternal peace.

Grimdo existed in the form of primordial chaos, who were sealed in the boundary ruins to maintain the balance of the universe. It is capable of swallowing and inverting planets into a chaotic dimension.

The greatest adversary of the Land of Light, the malevolent puppeteer behind the Ultimate Wars and the Period of Monsters. He commands all evil races to launch invasion and extinguishes every sun.

Long ago, Belial and Ken fought against Alien Emperor together. Thereafter, Belial succumbed to the temptation of power. Thus Alien Reiblood merged with Belial, turning him the strongest successor.

Guar, an immaterial entity born from a spatial distortion, revives from death every ten of thousands years, causing galaxy-wide distortions in the process. Once fully revived, chaos would envelop the universe.