So, this is an anthology series then with no direct links, I'm guessing.Although the whole paradox speech by the talking head author does mean they could just put it all down to some sort of 'dimensional mixing', which would allow then to tie up any number of loose and/or unrelated movies.
I think that is the direction they are going with - where some kind of incident like the particle accelerator malfunction (probably that event linked over multiple realities) unleashes something across multiple dimensions and the one(s) we are seeing in this one aren't necessarily the same as the other movies or our own.