Metroid 4 aka Metroid Fusion is the fourth entry into the Metroid franchise. In four entries the game saw NES, Gameboy, SNES and Gameboy Advance (this one) iterations. Samus returns to SR388 as a bodyguard encountering the soon to be named X parasite, infesting various animals. The parasite attaches to her, permanently fusing and altering her to her famous suit. She loses consciousness on the way home and crashes only to be repaired by scientists and sent back to SR3888 to investigate. This is where the game takes place.
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