On planet SR388, Space pirates attacked a Galaxy Federation research vessel and captured the Metroid creature. Metroid is a dangerous creature for all other species on this planet, it can parasitize any individual and destroy the subject by sucking up their energy. Intending to use them as biological weapons to destroy all creatures, this group of space pirates planned to create Metroid by exposing them to beta rays to stimulate their fertility. Facing that threat, the Galactic Federation sent Samus Aran – a bounty hunter – to infiltrate the pirate group’s base and destroy biological weapons.
