Belial, who was thought to have been defeated by Ultraman Zero in the decisive battle at the Monster Graveyard after stealing the Plasma Spark Energy Core of the Land of Light, built a mighty galactic empire in another space and reigned as its emperor.

After organizing the Belial Imperial Army, whose main force is robot weapons such as Legionoids and Darklops, he invades various planets to plunder Emeral Ore, which holds immense energy. While conquering Planet Annu and Planet Esmeralda, at the same time, he sent the Darklops legions to the Land of Light, which had exiled him.

He wears a crimson mantle and has a scar on his right eye from the battle with Zero.

He possesses powerful attack methods such as sharp claws and the Deathcium Beam, which he fires with his arms crossed.