Ridley is a high-ranking Space Pirate, the archenemy of Samus Aran, and one of the most common recurring characters and antagonists in the Metroid series, appearing in most of the games. He is the main antagonist of the Metroid series, although he is usually a secondary antagonist in each appearance and is only the final boss in one game. Sadistic and bloodthirsty, Ridley delights in death and destruction, and was responsible for the massacre of the colony K-2L. Since then, he and Samus have clashed several times, with Samus usually emerging the victor. But Ridley's brutality is matched only by his resilience, and he regularly returns from apparent death to do battle with Samus once more. As such, the Space Pirate leader is fittingly referred to as the Cunning God of Death (狡猾の死神?) in his Zero Mission official art on the Japanese website.