The Underworld is a realm of dark magic where demons plot.
Trivia[]
- In "Sweet Tooth", it was mentioned that the Harbinger of Hell was one of the most powerful forces in the Underworld, and Persephone is the goddess of this dimension.
- In "Keep Calm and Harry On", Mel Vera once mentioned Tartarus as "the Alcatraz of the Underworld." However, it is not entirely clear whether she meant the real dungeon or just voiced the fact that Harry Greenwood and Hunter Caine fell down somewhere.
- In the original series, the Underworld was one of the eleven planes of existence. It resembled a dark labyrinth of underground or volcanic caves and chambers inhabited by most of the Demonic Hierarchy. The exact location and description of the underworld have been inconsistent over the course of the show. While some episodes clearly establish it as being a different plane, sometimes referenced were made to it actually being below the surface of the earth.