Imagine an infinite number of different Earths, one for every possible evolutionary and historical possibility. Now imagine someone creates a machine which randomly picks creatures from those alternate Earths. What comes out of the machine?
It could be anything from humans where the Inca’s discovered Europe to dinosaurs from a world where the asteroid missed or even intelligent ants where evolution has taken a vastly different track. There can be nothing magical nor super-natural, only people and things which could be ‘real’ in 2015 on an alternate Earth. What are they, what can they do and how will they react to living on our Earth?