The Metroid Series is a popular action-adventure video game franchise created by Nintendo. It follows the character Samus Aran, a bounty hunter who battles space pirates and alien creatures. The games are known for their exploration-based gameplay, where players navigate interconnected environments to uncover upgrades and new abilities. First released in 1986, the series has evolved over the years, introducing 2D and 3D gameplay styles. Key titles include Metroid, Super Metroid, and Metroid Prime. The franchise is celebrated for its atmospheric storytelling, innovative design, and the iconic character of Samus, who is often regarded as one of gaming's first female protagonists.