that you reincarnate you that you incarnate you as someone who does not belong to earth but still grow up as a normal human being even if you feel that you do not belong and then you can be engineered as a very young so your genetic material is a mixture of the two and it can also be combined with the first so you are incarnated and manipulated and the last is where we need to be a little careful because it is decidedly aliens who disguise themselves as humans to achieve and affect the power structure