Metroid : Walkthrough / STORY but can be reactivated and will multiply when exposed to beta rays for 24 hours. It is suspected that the entire civilization of Planet SR388 was destroyed by some unknown person or thing, and there is a strong possibility that the lifeform just discovered was the cause of the planet's destruction. To carelessly let it multiply would be extremely dangerous. The Federation researchers had named it "Metroid" and were bringing it back to Earthwhen it was stolen by the space pirates! the fortress planet Zebes,and launched a general attack. But the pirates'resistance is strong, and the Police have been unable to take the planet. Meanwhile, in a room hidden deep within the center of the fortress, the preparations for multiplying the Metroid are progressing steadily.