Parasite Queen (named Vs. Parasite Queen in Brawl) is the theme that plays during the battle with the boss of the same name in Metroid Prime. The theme bears resemblence to Mother Brain's theme in Super Metroid. The theme was re-arranged for the Fire and Arctic Spawns in Metroid Prime Hunters. The original theme is re-used in Super Smash Bros. Brawl on the Frigate Orpheon stage, and on Pyrosphere in Super Smash Bros. for Wii U. In the latter game, the song must be unlocked by recovering stat boots stolen by a Metroid in the Smash Tour mode.