In the time before time, the heroic Toa Metru returned to the island city of Metru Nui, confident in their ability to save the Matoran, who were cast into an imprisoned and endless sleep by the evil force of The Makuta.But greatness and victory have never been easily won.

BIONICLE 3 returns viewers to Metru Nui, but much has changed since the noble Toa proved that they were the Legends of Metru Nui. The city has become a darker more mysterious place, shrouded in webs, roamed by wild Rahi beasts, it has become a city of creeping shadows.

The Toa, buoyant from their recent victories, enter the city only to discover that more powerful creatures now rule their former home, the Visorak horde. A pack of poisonous Visorak makes light work of capturing the unprepared Toa. Cocooned and suspended in spider like webs high above the city, the once glorious heroes find themselves presented for the amusement of the horde and their pompous king, Sidorak.

Roodaka the king’s dark mistress realizes the value of the Toa and she persuades her king to let her keep their bodies – she has a plan to use their elemental powers to free her true love The Makuta.

The Toa emerge from their cocoons transformed into beast like Toa Hordika, only to find themselves plunging to a certain doom, when at the last minute they are rescued by six aged and wise strangers called Rahaga. The Rahaga reveal that the Toa Hordika’s only hope of saving themselves from the beasts that they are becoming is a mythical rahi called Keetongu. So begins an action packed quest across Metru Nui in search of the creature that will hold the fate of the Toa in its hands. A quest that will lead to a battle for Metru Nui.

But the greatest battle the Toa face will not come from others – it will come from within. Tormented by guilt over his perceived failures and blamed by his comrades for their plight, Vakama is tempted by Roodaka to turn on his friends. Accepting command of the Visorak horde, he prepares to lead them against his brother and sister Toa.

In a city shrouded in webs of deceit, Vakama and the Toa must face the darkness within themselves if hope is to triumph.