After several adventures, the travellers arrive at the Emerald City and meet the Guardian of the Gates, who asks them to wear green tinted glasses to keep their eyes from being blinded by the city's brilliance. Each one is called to see the Wizard. He agrees to help them all if they kill the Wicked Witch of the West, who rules over Winkie Country. The Guardian warns them that no one has ever managed to defeat the Witch of the West.