Giant Robo: Chikyuu no Moetsukiru Hi  

Giant Robo: The Day the Earth Burned, ジャイアントロボ 地球の燃え尽きる日

An alternate, slightly darker continuity of the Giant Robo OVA, featuring Daisaku Kusama amidst a power struggle between the International Police Organization (IPO) and the Magnificent Ten of Big Fire (BF group).