 These have never been explicitly linked to the other "2000 AD" stories, but stand together as an independent universe of their own.However, one particular species of alien of Smith's creation has appeared in both the Smithiverse (in "Firekind" and "Tyranny Rex") and in a "Judge Dredd" universe story ("Pussyfoot 5", a spin-off from "Devlin Waugh").Smithiverse stories include "Indigo Prime", "Tyranny Rex" and "Firekind".