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Picture the DC Universe without Superman or the Kryptonians or any other alien race that looks like humans for that matter. Now, imagine that at the end of the universe, a rogue group of highly advanced humans, still looking the same as they did billions of years ago due to genetic manipulation, travelling back in time to escape the heat death.
In the past, the humans spread across the stars. Through genetic manipulation and interbreeding with other species, new races are created, looking either exactly like humans or with some slight differences, such as an extra bodypart or an unusual skin color. This is the DC Universe we know today.
At least, that's how I like to imagine it.
