After the X-Parasite infection and subsequent Metroid vaccine, Samus's Power Suit was surgically removed, leaving her with the organic Fusion Suit. This suit is initially weak but gradually regains abilities by absorbing X-Parasites that mimic her original powers. The Fusion Suit is immune to the X-Parasite's direct harm, making Samus the only one capable of fighting the infestation. Her unique biology is central to the game's narrative and mechanics.
