B586 BIONICLE Adventures 9 : Web of Shadows After the Toa Metru re - entered the city of Metru Nui on their mission to rescue to Matoran , the Toa quickly discovered that the entire city was shrouded in mist and strange webbing . However , due to the overconfidence of their leader , Vakama , the team was quickly ambushed and captured by the spider - like Visorak . Condemned to die by the Visorak king Sidorak and his repulsive viceroy , Roodaka , the Toa were saved by six bizarre , Rahkshi - headed freaks called Rahaga . But the venom of the Visorak had done its damage - the six Toa had been mutated into grotesque half - Toa , half - beast monsters called Toa Hordika ! Having decided to recover the Matoran and worry about themselves afterwards , the Toa Hordika and Rahaga quickly began executing a plan of action , while fighting off both Visorak and the Toa ' s own beastly natures . Eventually , Vakama strayed from the other Toa to have some time alone to think - and was promptly ambushed and captured by more Visorak . He was brought to Roodaka , who saw him as a useful pawn and offered him command of the Visorak horde . Eventually , Vakama accepted this offer , and Roodaka sent him on a mission to prove his worth : capture the Rahaga . With Vakama defected to evil and five Rahaga captured , the remaining Toa Hordika and Rahaga Norik quickly changed priorities and began to track down the mythical Rahi named Keetongu - a legendary creature said to have the ability to counteract Visorak venom . Eventually , Keetongu was found , but he refused to cure the Toa ; nevertheless , he decided to help them against the spider invaders . Meanwhile , having earned Sidorak ' s trust - and command of the Visorak - with the five captured Rahaga , Vakama settled down in the Coliseum , now the headquarters of the Visorak , to await the final battle with the Toa Hordika . . . which came none too soon . While the four Toa Hordika headed straight for the imprisoned Matoran and Norik rescued his fellow Rahaga , Matau went off for Vakama in a last - ditch attempt to reclaim his friend and leader to the side of light . Meanwhile , Sidorak was shocked to see the supposedly - nonexistent Keetongu , but he was subtly forced by Roodaka to engage the Rahi in combat . Roodaka cleverly wounded Keetongu and abandoned Sidorak to be killed by the Rahi ; she then triumphantly faced the Toa Hordika - now five again - and Rahaga . All five Toa lashed out at her with their Rhotuka spinners , but the onslaught only caused her to laugh . Vakama appeared by her side , but with a surprising announcement : he had indeed forsaken the darkness , and was now again allied with the embattled Toa and Rahaga . At his command , the Visorak scattered , leaving Roodaka all alone . Vakama then struck her with a Rhotuka spinner , but in vain - she was carrying a piece of the Protodermis prison of Makuta , and when the spinner hit , Makuta ' s prison was undone , freeing the master of shadows into the world once more . But the Toa Hordika - now transform ] ] ed back into Toa Metru by Keetongu - were able to complete their mission : the Great Rescue , the mass transit of Matoran from the damaged City of Legends to the island of Mata Nui .