SR388 is a fictional planet in the Metroid video game series, primarily known as the home of the Metroid species. It is depicted as a toxic and dangerous environment, filled with various alien creatures and challenging terrain. The planet plays a significant role in the backstory of the series, particularly in the origins of the Metroid organisms. In the games, SR388 is explored by the protagonist, Samus Aran, who is a bounty hunter. Her missions often involve investigating the planet to uncover its secrets and combat the threats posed by the Metroid creatures. The exploration of SR388 contributes to the overall lore and depth of the Metroid universe.