Metroid: Zero Mission tells the story of Samus Aran's very first mission on planet Zebes as she explores a labyrinth of tunnels, caverns and caves crawling with fierce enemies bent on her destruction. Her mission? To exterminate all Metroid organisms on Planet Zebes, and defeat the mechanical life-form Mother Brain. To accomplish this task, Samus must power-up her suit with a wide variety of hi-tech upgrades and advanced weaponry.