The Grim Adventures of Billy and Mandy Wiki
The Grim Adventures of Billy and Mandy Wiki

The Underworld is where Grim became the Grim Reaper. It is the home of most monsters and supernatural creatures.


Many areas in The Underworld follows classical depictions. It is a fiery, nearly barren land of death that is mostly covered with lava. Demons, monsters, and all other evil species reside in the Underworld. However, some areas have a more modern take, and resemble monterous cities.


It appears to currently be very similar to modern countries, having a modern-styled court system, a grade school system, and even various products and companies.

Locations Within The Underworld


See Underworld/Gallery


  • It is a homage of Hell, which Satan lives here.