Math Blaster Episode II: Secret of the Lost City is an educational game in the Blaster Learning System by Davidson & Associates and is the sequel to Math Blaster Episode I: In Search of Spot. In the plot of this math game, the evil Dr. Minus shoots down Blasternaut, Spot, and Galactic Commander as they search for the Lost City in their Galactic Cruiser. They crash, thankfully, next to the Lost City. Dr. Minus' 'Negatrons' try to stop them as they unlock the secret of the Lost City to save Galactic Command.