>>512488066
>breed with humans
that's the thing that is not believable
there is zero reason for an alien organism to be remotely compatible with human or even any earth organism genetics, with its extremely specific DNA and reproductive cycle
there isn't even any reason for them to have the same nucleotides as us
when there is a malfunction as trivial as an excessive chromosome, it causes malfunction or death between two humans
alien intercourse will produce inert biosoup