Samus Aran receives an "Unnamed Suit" at the end of Metroid Fusion. During the events of Fusion, Samus was infected by X Parasites and much of her Power Suit was surgically removed. She was given a vaccine made from the DNA of the Metroid baby that saved her life. While this meant that Samus was now completely immune to the X Parasites, it also gave her the Metroid's weakness to cold. Because of this weakness, the Adam computer conjectured that the new Fusion Suit would reject the Ice Beam upgrade, so the Galactic Federation never tried to create a downloadable version for Samus.