A time traveling detective arrives from two centuries in the future, searching for Astro and the infamous surgeon, Black Jack, in order to save the life of Princess Sapphire of Silverland, who, in a twist of irony, was injured from an earlier excursion to the past by the time traveller; At the same time, the adventurer was also tracking down a rogue fugitive from another time; Gor, an evil sorcerer who is plotting to usurp the throne from Sapphire and conquer all of Silverland with an army of monsters to do his bidding...