Argos (アルゴス, Arugosu) is the main antagonist of Kamen Rider Ghost: The 100 Eyecons and Ghost's Fateful Moment. He was a prince of the Gamma World royal family who transformed into the first Kamen Rider Dark Ghost (仮面ライダーダークゴースト, Kamen Raidā Dāku Gōsuto) and later Kamen Rider Extremer (仮面ライダーエクストリーマー, Kamen Rider Ekusutorīmā). Argos was evidently born at some point by the mid-19th century at the latest. [Reverse! Mysterious Science!] The first born son of what would become the Gamma royal family,