The Underworld is a realm on ABC's Once Upon a Time. It is a place where souls of the departed travel to after they die when they have unfinished business, and is identical to Storybrooke.
- Arthur Pendragon (ruler)
- Deceased people
- Cruella De Vil (former ruler)
- Hades (former ruler)
- Charon (worker)
- Fury (worker)
- The Underworld is based on the legendary afterlife from Greek Mythology.
- The Netherworld is supposed a realm between life and death. In a way, the Underworld is also a sort of limbo, and the souls that go there usually either move on to Mount Olympus or someplace far worse.
- Regina nicknames it "Underbrooke", due to its uncanny resemblance to Storybrooke.
- S3, E18: "Bleeding Through" (portal)
- S5, E12: "Souls of the Departed"
- S5, E13: "Labor of Love"
- S5, E14: "Devil's Due"
- S5, E15: "The Brothers Jones"
- S5, E16: "Our Decay"
- S5, E17: "Her Handsome Hero"
- S5, E18: "Ruby Slippers"
- S5, E19: "Sisters"
- S5, E20: "Firebird"
- S5, E21: "Last Rites"