Metroid (Magazine Z manga)

This manga provides early history on series heroine, Samus Aran from K2-L to her second raid on Zebes.

Chapter 1 details Samus's childhood, including how she got acquainted with the Chozo and how the Space Pirates destroyed her home at K-2L.

Chapter 2 details how the Chozo train Samus on Zebes, and introduces Mother Brain as a Chozo computer.

The story continues in two books, for a total of 14 chapters.

The Metroid manga and the characters it introduces are widely accepted as the canonical backstory for Metroid.