Cacodemon/Doom 64

In Doom 64 the Cacodemon first appears in MAP03: Main Engineering. It underwent a major design change, becoming beige brown, with a single yellow-green eye, and gaining two arms with broken chains attached, and a rather terrifying face. Instead of a screech it lets out a loud, frightening hiss when spotting the player, and the body of the monster has animation frames (mostly in the way it swings its arms when in flight), whereas the original cacodemon floated in a motionless manner. It resembles Doom II's original pain elemental. The nightmare Cacodemon variation, introduced in the Doom 64 TC, remained hot red.