Demonic Database! 
Dark Kingdom
The Dark Kingdom, known as the Negaverse in the NA Dub, was an evil organization led by the mysetrious, yet manevolent Queen Metallia. Under her control was a woman, who became known as Queen Beryl, who in turn controlled the four Shitennou or Heavenly Kings of Earth. Their names were Jadite, Zoisite, Nephrite, and Kunzite. In the present when the senshi battle them, they held their base at D Point near the North pole. Their main objectives were to collect energy for Queen Metallia, who yearned for the power of the Ginzuishou in the both the past and present.