Metroid II: Return of Samus is a 1991 action-adventure game developed and published by Nintendo for the Game Boy. The first Metroid game for a handheld game console, it was released in North America in November 1991 and in Japan and Europe in 1992. The game follows bounty hunter Samus Aran on her mission to eradicate the Metroids from their home planet, SR388, before the Space Pirates can obtain them. Players must find and exterminate the Metroids to progress.

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.