Ghost Skull

Ghost Skull
A ghost Skull is a non-fighting spirit found in the Mars city Underground Systems during the Invasion. When the gateway was opened, Ghost Skulls got from the teleporter and transformed nearly all of the base personnel into Zombies. The Ghost Skulls had comed like a Shockwave that pased from the entire base.

Porpuses
The Porpuse of the Ghost Skull was originally to transform the Humans and to join the forces of hell. But another porpuse was to transform the marines and make them as a type of Super Warriors called Commandos. With that the Hellish Swarm became stronger and used the Human Technology against them.