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Main Theme (Metroid) is a metal arrangement of the Brinstar theme that first appeared as the background music in Metroid Prime Pinball and later found its way into Super Smash Bros. Brawl on the Norfair stage with an 8-bit section and narration by Jay Ward added, much like Opening/Menu (Metroid Prime). He says: "Samus is under fire. She's sent an emergency directive: Join the fight!"
Unlike Opening/Menu (Metroid Prime), this narrative does not appear to have borrowed text from other sources.
The song returns in Super Smash Bros. for Wii U.