The Evil One is a malevolent entity that serves as the main antagonist of the original Splatterhouse series. It is the ruler of the Void and the demons that reside in there. It made its first appearance in Splatterhouse 2 as a stage hazard and in Splatterhouse 3 as the penultimate boss.
Unlike other monsters in the series, which are grotesque in appearance, the Evil One has a bright, radiant appearance with a humanoid figure. It is tall with a bright blue aura, and resides in a dimension with a rather regal appearance.