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Boss may refer to multiple subjects in the Metroid series. You may be looking for:
List of bosses in the Metroid series
Mini-Boss, a weaker type of video game boss
Mini-Boss Hideout I, an area in Brinstar
Mini-Boss Hideout II, an area in Norfair
Pirate Boss, a Space Pirate from Zebes Invasion Order
IceBoss, a concept from Retro Studios
Spider Boss, another name for Yakuza by Prima
Boss, a Space Pirate from Episode of Aether
Boss Package, an unlockable Concept Gallery
Boss Creature, a concept from Next Level Games
Mini Boss Confrontation BGM (Spore Spawn, Botwoon)
Big Boss Confrontation BGM (Kraid, Crocomire, Phantoon)
Big Boss Confrontation BGM (Ridley, Draygon)
Theme ~ Space Warrior Samus Aran's Theme ~ Big Boss BGM ~ Ending
Boss Reptilian, the battle themes of Bryyonians and Defense Drone
Boss Go, a theme that plays after boss battles
Boss Mae, a version of Boss Go that plays when certain bosses are introduced
Boss Before, a theme that introduces new Metroids
Boss Alpha, the Alpha Metroid's battle themes
Boss Arachnus, Arachnus's battle theme
Boss Gamma, the Gamma Metroid's battle theme
Boss Zeta, the Zeta Metroid's battle theme
Boss Omega, the Omega Metroid's battle theme
Boss Manic Miner Bot, the Diggernaut's battle themes
Boss Queen, the Queen Metroid's battle theme
Boss Ridley, Proteus Ridley's battle themes