Uncle Scrooge shows Donald and his nephews his atom subtracter able to miniaturize a huge machine to place it in a small rocket, but a Beagle Boy disguised as a janitor nearby overhears the conversation.; Uncle Scrooge attends a parade of old cars a little amused. However, when he sees that even his nephew Donald participates in and earns money through this, he decides to get his own car and compete in a race against Donald.; Gyro Gearloose sends Donald back in time to see how Sir Sooth Duck became a hero.