Metroid Prime Battle (also known as VS Metroid Prime (Head), in the Japanese-titled soundtrack) is the name given to the theme heard when fighting the Metroid Prime's core essence form in Metroid Prime. However, in at least the NTSC GCN release, the player has to let the cutscene where the creature's core essence emerges play in full, as otherwise the BGM will be muted throughout the entire second phase. It actually contains the main theme used for the title themes of all Metroid games except Echoes. The theme was re-arranged in Metroid Prime Pinball for the same boss and remixed for Gorea's second form in Metroid Prime Hunters. The original version of the theme appears in Metroid Prime 2: Echoes Bonus Disc, used for the actual game's trailer.