Donald, who wants to improve his knowledge, seeks Gyro’s advice. Indeed, the ingenious scientist has an invention at hand which expands mental capabilities. Unfortunately, the additional knowledge fails to come upon Donald, instead he now has to fight with side effects. Shortly Donald grows to giant size and, after some incidents, has to hide in a warehouse. However, Gyro manages to shrink the duck back to his normal size. Due to new side effects Donald now thinks he is Napoleon.