After Samus eradicated the Metroids on SR388 in Metroid II, Biologic Space Labs is sent to investigate how the extinction affected the natural order. Samus is sent to accompany the team to the planet's surface.
An unknown virus, dubbed X, infects Samus's Power Suit. A vaccine made from Metroid cells is administered and she immediately recovers.
However, the virus quickly spreads through the BSL station, and Samus finds herself alone with only the ship's computer to guide her as the specimins collected by the scientists run amok, and Samus's infected, fully-powered Power Suit leaves a trail of destruction through the ship.
Region |
Name |
Release |
 |
Metroid Fusion
|
18 Nov 2002 |
 |
Metroid Fusion
|
22 Nov 2002 |
 |
メトロイドフュージョン
Metroid Fusion
|
14 Feb 2003 |
Re-releases
System |
 |
 |
 |
Wii U Virtual Console |
30 Apr 2014 |
03 Apr 2014 |
03 Apr 2014 |
Some of the large X Viruses are surrounded by barriers made out of blocks of metal. In the top-left corner of the barrier, one of the metal parts is a GameCube.