Metroid: Zero Mission begins right where the original Metroid game opened, as interstellar bounty hunter Samus Aran infiltrates Mother Brain's massive complex below the surface of planet Zebes. It becomes immediately obvious, however, that this adventure is very different from the first mission: dark corners teem with unfamiliar enemies, a maze of new paths lead into the unknown, and fresh puzzles lie unsolved. Samus herself is equipped with all-new techniques to face the dangers that lurk in the depths of Zebes, and she will need all the powers at her disposal if she hopes to survive. Metroids, Space Pirates, and Mother Brain herself await in the depths of the planet, but thier evil designs are just a part of a deeper story that can only now be told...