Bionicle 3: Web of Shadows (2005 Video)
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Web of Shadows takes place between the penultimate and final scene of the previous movie, Bionicle 2: Legends of Metru Nui (2004). Edit (Coming Soon)
These are only fan suggestions, since the creators never quite explained this part well.
Roodaka needed the bodies of the Toa to drain their powers and free Makuta, but she kept this secret. Had Sidorak simply dropped them to their deaths, Roodaka would have needed to come up with an explanation for why she needed the bodies, and Sidorak might have grown suspicious of her. So he convinced Sidorak to let the Toa mutate in their cocoons and retrieve their mutated bodies as proof that he had gotten rid of them in a "legendary" fashion. But in reality, Roodaka just wanted to manipulate Sidorak to bring the Toa's bodies to her without raising any suspicion.
Some fans also suggest that she needed the Toa to be mutated because their elemental energies could more easily be drained from them in this state. Edit (Coming Soon)
The movie is infamously vague about what happens to her.
Once the Toa defeat her, Roodaka falls to the ground. Then, a hand made out of shadow energy rises up from her heartstone, grabbing her limp body and disappearing with it. Later story material explained that Roodaka wasn't dead, only unconscious, and the hand belonged to her master Makuta, who teleported her away to keep her safe from the heroes. Edit (Coming Soon)
The Rahaga were once mighty Toa heroes, called Toa Hagah, until Roodaka mutated them into the forms we see in the movie. They are essentially combinations of drastically depowered Toa, akin to Turaga elders, and Rahkshi, the villainous creatures from Bionicle: Mask of Light (2003) -- hence the name "Rahaga", Rahkshi + Hagah, or Rahkshi + Turaga.
Much later in the storyline, Roodaka was forced by the Toa Nuva to transform them back into their original Toa selves. Edit (Coming Soon)
Some movie summaries claim that king Sidorak and his viceroy Roodaka belong to the Makuta species -- this is false; they are merely servants of the Makuta. Roodaka's species is called Vortixx, while Sidorak belongs to an unnamed species that formed an aristocracy on their home island of Stelt. Edit (Coming Soon)
No -- romantic love doesn't exist in the Matoran Universe. Their marriage would have been a strictly political alliance, and Sidorak's eagerness to impress and marry Roodaka as fast as possible wasn't fueled by love or sexual lust, but simply his lust for power, as their alliance would have granted him special governance over Roodaka's home island. Edit (Coming Soon)
Toa Metru/Hordika: Vakama, Nokama, Onewa, Nuju, Matau, Whenua.
Rahaga: Norik, Gaaki, Iruini, Bomonga, Kualus, Pouks.
Roodaka, Sidorak, Makuta Teridax.
Visorak: Keelerak (one of whom is called Kollorak), Suukorak, Boggarak, Vohtarak, Roporak, Oohnorak, Kahgarah.
mutated Muaka, Lorahk, numerous birds and bugs and Kraata worms, a comatose Ga-Matoran
Cameo: Takanuva, Jaller, Hahli.
The movie takes place in Mata Nui's brain. Edit (Coming Soon)
Roodaka's main objective is freeing their master Makuta from his protodermis cage, whereas Sidorak is more concerned with marrying her and extending his kingdom both onto Metru Nui and to Roodaka's island (Xia). The only way to free Makuta is to break the seal which the Toa created to keep him imprisoned, and the only way to break the seal is to expose it to the elemental energies of the Toa who have created it. To this end, Roodaka carries a fragment of Makuta's crystal prison between her breasts -- as the fragment is "magically" connected to the real cage, should it get into contact with the Toa's powers, the seal would be broken.
This is why she's after their elemental powers and also why she lets the Toa shoot her with their combined energies at the end. The Toa's powers reach the stone she keeps in her breastplate, which sends a signal that frees Makuta from his cage. Edit (Coming Soon)