The 31st Century is the 1000-year period between the years 3000 and 3999. By this era, the Superman Dynasty seems to have died out, however the Federation of Planets is now protected by the Legion of Superheroes, which was inspired by Superman's legend.
Advancement[]
By this era, everything seemed possible. The Legion of Superheroes employed personal Flight Rings that allowed them to fly without a vehicle, for example.