In a way, we are all alien microorganisms taking over the brain of our host. If you think about it. I mean, really thing about it.
Okay yes but in this context it means life from outer space.
But are we not also floating through the cosmic void, our solar system swirling in our galaxy, our galaxy itself hurdling itself through the cosmos. I play my cards right and I can control our hosts brain while it eats a tasty snack. Yum
You may have a point.