You Samus received a distress call alerting her to return to the colony immediately. She finds the scientists dead, and the Metroid larva stolen by Ridley, leader of the Space Pirates. Samus escapes from the colony during a self-destruct sequence and follows Ridley to the planet Zebes.She searches the planet for the Metroid and finds that the Pirates have rebuilt their base on Zebes. And you are currently on the surface of zebes and your task is to defeat the 4 bosses and get to mother brain.