In 1999, man established an Alpha base on the moon to protect nuclear waste from the earth and to carry out scientific research. A total of 311 regular staff are working at the Alpha base. On September 13, 1999, disaster struck. The nuclear waste piled on the moon exploded, causing a series of chain reactions, and the moon was thrown out of the earth's orbit and thrown into the depths of the universe under a powerful impact. This is where the story of Space Legend 1999 begins.