While patrolling Metru Nui, Takanuva was attacked by a Shadow Leech. When the Toa of Light awoke, part of his light has already been sucked out. Now, with the ability to control both light and darkness, Takanuva was encountered by Helryx, Krakua, and Brutaka who gave him a mission to go to Karda Nui and find the Toa Nuva in order to relay an important message to them. Brutaka then attempted to send Takanuva to Karda Nui through his Olmak, but the mask was damaged and not functioning properly. As a result, Takanuva ended up first in the The Kingdom and The Journey of Takanuva pocket dimensions respectfully. After that, he went into an alternate universe dominated by the Toa Empire.
After he arrived, he encountered Kapura, who thought Takanuva was going to punish him. The Matoran was later frozen by Kopaka, who then froze Takanuva and told the Toa of Light that he had committed a crime.
Later he was taken to the cells where he talked to his parallel self. They escaped and they headed to the Archives. They rescued Dume, who had stood up to Tuyet and gotten put into a stasis tube. They were then captured by Tuyet.
Tuyet forced them further into the Archives. She led Takanuva into a room and revealed herself as Teridax. Now in the room there were three Makuta: Teridax, Krika, and Kojol. They offered to smuggle Takanuva out of the city to find Brutaka, as long as he intercepted the delivery of the Vahi and gave it to them. The Makuta also added that Jaller was the leader of the caravan.
In order for Takanuva to be able to intercept the caravan, Krika exposed Takanuva to a virus which would (at least temporarily) grant him flight. He then confronted the Toa guarding the caravan, pretending he had been sent by Tuyet. However, they saw through his deception and exposed him.
Later, the caravan was attacked by Lesovikk. With the Mask of Time, he and Takanuva returned to Metru Nui and met with Pohatu, who also opposed Tuyet. They then joined the rest of the resistance group, upon which Pohatu revealed that they planned to mount a full-scale attack against Tuyet. When Takanuva, joined by the resistance and the Makuta, arrived, they attacked the Coliseum. After watching his parallel self perish, he followed the Dark Hunter Darkness to the Chamber of Masks. Once inside, Takanuva was confronted by Tuyet, Nui Stone in one hand and Olmak in the other. She had figured out that Takanuva was not from their universe. Takanuva then prepared to fight her. As she battered him, she put on the Olmak. Takanuva fired at her blasts of light and shadow, which she deflected. Both of them then noticed that numerous species had united and were heading for the Coliseum. He convinced Tuyet that she might be able to start over if she uses the Olmak. She does just that and Takanuva snatched the mask off her face and jumped into the portal. Tuyet tried to pulled him back. She was so filled with rage that she never noticed the portal closing. Takanuva escaped and Tuyet's body was left between the void and the Coliseum and met her death. Takanuva hovered through the "inter-dimension". He wondered that if Tuyet's death was going to leave the Toa as protectors again, or if the Makuta would take over as dictators. He concluded that he would eventually return to find the answer. He then resumed his journey to Karda Nui to help the Toa Nuva.
Swamp of Secrets
In the Karda Nui swamps, Takanuva emerged from a pocket dimension. After 3 tries to get to Karda Nui, he'd finally arrived. There he found Toa Mistika Gali Nuva, in battle with Makuta Krika. He flew to Krika, who saw Takanuva, and sadly disappeared. Takanuva helped Gali to her feet and they began looking for the other Toa Nuva. Then Takanuva spots an orange Toa-shaped being in the distance and prepares to battle... Takanuva looks more closely at the figure and realizes it's Toa Pohatu. He then found out that he'd been an Av-Matoran and that the Makuta were draining the Matoran's Light. He swore that he will save the Matoran, even if he must die. The trio then encountered some violent insectoid creatures called Niazesk. Noticing the Toa, they attacked. Gali and Pohatu soon started fighting. Takanuva lowered his lance to blast the Niazesk with light but changed his mind in favor of his Shadow powers to take down all of the flying Rahi. Raising his right hand, he called upon the power of shadow, blasting the oncoming Niazesk directly. The Toa of Twilight turned towards his teammates, thinking they would congratulate him on winning the fight. Instead he saw fear in their eyes, and Pohatu pointing his weapon at him. Pohatu said that he had always wondered where Makuta Teridax had gone and now he knew. Takanuva asked Pohatu if was crazy and if he seriously thought he was a Makuta. Pohatu said yes, and said to Takanuva that if he really was Takanuva, he had 10 seconds to give Pohatu reason not to "Skyblast" him out of existence. Remembering that he had formed a bond with Gali on Mata Nui, Takanuva quickly suggests she read his mind. She did, citing his trips through The Kingdom and Dark Mirror during the process. His identity confirmed, Takanuva had the two Toa Nuva brief him on the current situation in the Swamp. Afterwards he tipped the balance of the battle and drove the Makuta back. He met the Toa Ignika and learned about the countdown to the end of the universe, then, Takanuva told the Toa Nuva that the Energy Storm was to be released after the awakening of Mata Nui and destroy everything in Karda Nui except the Codrex.