title: Ridley (Metroid)
context: Ridley,[lower-alpha 1] also known by his aliases Geoform 187 and The Cunning God of Death, is one of the main antagonists of the Metroid series. An extraterrestrial dragon, he became Samus Aran's archenemy after leading a Space Pirate raid on her homeworld that killed her parents. Despite having been destroyed numerous times by Samus, he is always resurrected, thanks in equal part to Space Pirate engineering and his natural regenerative ability, which allows him to swiftly recover from what would otherwise be fatal wounds as long as he is able to consume enough biomatter from his fallen adversaries.[1]
question: Who are the main villains of Metroid?
answers: The Cunning God of Death