The City of Worms is a massive Leeran city found under the sea of planet Leera. The city resembles a massive, multi-colored, shell full of holes that Leerans could enter into. During the Yeerk invasion of Leera, the city was fortified with loads of Leeran beam weapons. It also appear to be the command center for Andalite and Leeran Forces on all of Leera.