The Rat's Den was hideout of the mutant Ratmen. They were led by the King Rat; as a throne he used a car decorated with dead baby Orbs on sticks.
One entrance was at the Hyde Street Pier. Its main gate led to the sewers under Ghirardelli Square and operated with a Ring.
Day 1[]
A Ratman stole the Viewer from the Dragon Clan and brought it to the Den.
Day 2[]
Two Dragons went to Pier 5 and muzzled and killed a mutant in order to take his finger with a Ring that opened the gate but they couldn't remove it.
Phil Cook reached the Rat's Den, killed the King Rat and crowned himself their new ruler.
Day 3[]
A Dragon with Noah Goring went to Ghirardelli Square, perhaps to reach the lair, however they were attacked by Ratmen as the Dragon climbed to the roof of a building. The Manhunter took the Ring from the body, climbed to the roof and stumbled the stairway, to the bottom of which is the locked gate leading to the sewers. He unlocked it with the Ring. A pipe broke under him and, as Phil used the Viewer to look in the Orbs' underground operations, the Manhunter fell and knocked him down.
Phil dropped the viewer, knocking an Orb ornament off. Being exposed as a cyborg, he picked the Manhunter up and tossed him to the pack of rat-men below. He stunned them with a Camera and found a time to dash for the exit; he knocked the Ratman guarding the pipe to the Pier, and exited.