When the Toa Metru return to their city of Metru Nui, they find their town overrun by giant spiders. Can they save their city from this invasion? The Toa Metru return to the dark and deserted city of Metru Nui. Their mission: save the Matoran still trapped beneath the Coliseum in a deathlike sleep. But is the city truly empty, or does a terrible new danger wait in the shadows? The Toa Metru face their most monstrous enemy, the Visorak, and fall victim to its shocking power.