Metroid Prime and Dark Samus's origin- they connect...

Infestation:
"A second plague has come upon the land, dousing the last flickering hopes of our race. Drawn by the very force we Chozo hoped to contain, a host of maruding creatures descended from space and invaded our temple, the Cradle. They try in vain to destroy it, but its power remains beyond them for now. They possess some of the twelve Artifacts we call the Cipher, yet do not comprehend their
function. Ignorant creatures, they are blinded by delusions of harnessing the Great Poison for their own designs. They walk about as masters of the planet, assimilating the ruins of our sanctuary into their experiments. We can but watch and wait for our doom."

I don't know if their talking about Dark Samus - maybe, but I'd say they're referring to the Space Pirates...