Math Blaster: Episode Two - Secret of the Lost City

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