- "Fetch me their souls!"
- ―The Demonic Announcer at the beginning of a Hellhound round.
Hellhounds were an accidental creation by Group 935 scientist, Ludvig Maxis. Maxis put his daughters dog into the teleporter but it came out the mainframe a Hellhound. Maxis was then aware of the animal's pregnancy. When Samantha Maxis, the owner of the dog, questioned him about it, Edward Richtofen, Maxis' assistant, left the room and locked the door behind him. Fluffy then appeared and supposedly killed the two. Fluffy then gave birth and created more Hellhounds. Hellhounds made their first appearence at Shi NoNuma, and reappeared at Der Riese, Kino der Toten, Dead Ops Arcade and Moon. The Hellhound are replaced by the Pentagon Thief, the Space Monkies, George A. Romero, Napalm Zombies and Shrieker Zombies and Astronaut Zombies in "Five", Ascension, Call of the Dead, Shangri-La and Moon respectively.