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nuclear fusion
Metroid does NOT have the Fusion Suit, Metroid Fusion has the Fusion Suit, And no human on earth knows how to make a Fusion Suit.
hydrogen fusion
She is with Fusion Dexter in the Fusion Tunnel to Lab at Mandark's House and Galaxy Gardens.
She is spinning around Fusion Dexter in his lair at Mandark's House and the first Fusion to defeat in Fusion Dexter's lair in Galaxy Gardens