In 2004, the original NES release of Metroid joined several titles deemed classic enough to represent that period of gaming through revisits on the GameBoy Advanced, and yet that same year also saw a much more thorough revisit on the handheld with the release of Metroid: Zero Mission. Aside from several tweaks within the game, the release returned to the source of the series to establish cannon at ground zero, setting the tone and direction for all subsequent releases.
The most significant element of that release was the newly added Zero Mission, a mission that showed Samus Aran stripped of her armor and evading space pirates in the instantly iconic zero suit. It was the emergence of a more vulnerable, but still capable Samus, and a defining moment that opened the floodgates for a greater discussion of the role gender plays within the Metroid series, executed with clever subtlety.