A biosuit-clad scientist emerges from it, followed by a huge Hell Knight right behind him. Two of these massive monsters make their introduction in a cutscene (obviously mirroring the debut of the first two Barons of Hell as sub-bosses of Doom's first episode) in which the marine arrives at a teleportation room where he witnesses the portal to Hell being opened under Malcolm Betruger's supervision. The head of the Doom 3 incarnation of the Knight is somewhat similar to the Shambler from the first Quake. While the classic Hell Knight has horns and hooves, being meant to resemble a satyr or minotaur, the Doom 3 Hell Knight somewhat resembles a huge muscular skeleton or an alien. They are covered with scars and demonic runes, and have a pentagram on their forehead. Their skin is greyish-green and some parts, such as the mouth, upper chest, hands and feet, are red, possibly soaked with blood.

In Hell, Hell Knights show a different appearance from those on Mars. Assuming the Marine is 6 feet (1.8m) tall, the Hell Knight stands about 10 feet (3 meters) tall. It is easily the largest non-boss enemy in the game. Its obscure eyes are very small and black, located on the sides of the head just above the mouth. It has no visible nose, and its deformed ears resemble a human's, fused to the sides of its head. An in-game examination of its spine indicates it has a massive skeleton. The Hell Knight is huge and very muscular.

Baron of hell doom 3