Metroid is an action-adventure game developed and published by Nintendo. The first installment in the Metroid series, it was originally released in Japan for the Family Computer Disk System in August 1986. North America received a release in August 1987 on the Nintendo Entertainment System in the Game Pak ROM cartridge format, with the European release following in January 1988. Set on the planet Zebes, the story follows Samus Aran as she attempts to retrieve the parasitic Metroid organisms that were stolen by Space Pirates, who plan to replicate the Metroids by exposing them to beta rays and then use them as biological weapons to destroy Samus and all who oppose them.

Metroid is an action-adventure game franchise created by Nintendo. The player controls the bounty hunter Samus Aran, who protects the galaxy from Space Pirates and other malevolent forces and their attempts to harness the power of the parasitic Metroid creatures.