The Mancubus (plural: Mancubi) is one of the few Doom 3 monsters that remain faithful to their original designs. It is greenish-grey in colour, rather than brown like the classic Doom version. Like the original version, the Mancubus is a very large, fat demon with a fireball launcher for each arm, but, unlike the original, it does not fire the two launchers simultaneously, firing each in turn instead. The Mancubus stands about 2 heads taller than a normal human, and its bulk is about 2 to 3 times as wide.