Samus Aron is a female bounty hunter hiered by the Galactic Federation. She must go to the planet Zebes to stop Mother Brain and her diobolical plan to use the Metroids to take over the Galexy.

As a child, Samus was raised by Chozos to be a great worrior. They gave her a suite of armor that is compatable with their technology, and thus she is able to use the chozo artifacts left behind as power-ups.