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 and take down Mother Brain. However, this isn't simply a GBA version of the NES classic. Zero Mission has been revamped and enhanced with new graphics, new levels, and new bosses.