Metroid Fusion (メトロイドフュージョン, Metoroid Fyūjon) is an action-adventure video game published by Nintendo for the Game Boy Advance. It was released in North America, Europe, and Australia in November 2002, and in Japan in February 2003. The game is considered to be the fourth main installment in the Metroid series; the intro alternatively refers to the game as Metroid 4.