The name of the Metroid series comes from what?

The name of the Metroid series comes from an enemy in the game known as "Metroids." Metroids are parasitic organisms that have the ability to suck the life energy out of their prey, making them one of the most dangerous adversaries in the game. The central storyline of the series revolves around the protagonist, Samus Aran, battling against these creatures and space pirates who seek to exploit their power. The iconic name of the series is derived from these formidable enemies, highlighting their significance within the game's universe.