A graveyard universe, once home to a virtually perfected Earth prior to the events of Flashpoint as Earth-15 before being destroyed by the mad Superboy Prime. Now entirely barren, all that remains of this dimension is the mysterious Cosmic Grail, lost somewhere amidst the 52 universes of the Multiverse.
- First of the Earths to be destroyed by Superman-Prime.
- The home universe of Volthoom, the First Lantern
- This world is a direct continuation of the pre-Flashpoint Earth-15, though now all life rather than just the Earth has been annihilated.
- Earth 15 is opposite Earth 17 in the structure of the Multiverse.
- Earth 15 is part of the area in the local Multiverse termed "The Gloaming" with Earths 3, 10, 13, 19, 37, 40 and 43; it was once part of "The Brightlands" with Earths 5, 8 and 51 prior to its destruction.
- No trivia.
- Characters from Earth 15
- Other things related to Earth 15
- Earth 15's Comic Appearances
- Reality Gallery: Earth 15