Dr. Zalost has been unhappy since he can remember, and demands the mayor to give him a tremendous amount of money, but when he doesn't give it to him, he starts shooting cannonballs that make people unhappy. Muriel is hit by one, and she goes in a depressing state. But even when the mayor gives him the money, Zalost is still shooting the unhappy balls. Courage must go inside Zalost's tower and stop him once and for all.