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The Underworld[1] is a sub-level kingdom of Mewni ruled by the Lucitors (Wrathmelior and Dave), Tom's family, and inhabited by demons. It is seen in the opening as Star and Marco travel through various dimensions, and makes its first official appearance in "Blood Moon Ball".


The environment is rocky, covered in flames, lava, stalagmites, and stalactites, and seemingly underground. In Star and Marco's Guide to Mastering Every Dimension, it is located below the sewers of Butterfly Castle and has a castle from which Tom's family rules.

According to a map in Star and Marco's Guide to Mastering Every Dimension, areas in the Underworld include the Prickly Plains, the Mountain of Boom, the Dock of Unending Torment, and the Lake of Fire.


  • According to Star in Star and Marco's Guide to Mastering Every Dimension, the ruling Lucitors have a reputation for being "aggro" and supposedly "take care of lava and lost souls".
  • The Underworld holds the Blood Moon Ball every 667 years.



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