A year after their battle with the Arcane Order, master wizard Hisirdoux "Douxie" Casperan and former Arcane Order member Nari lure their pursuers Belloc and Skrael onto a moving subway train in Metro City where they launch a surprise attack with former Trollhunter Jim Lake Jr. and his girlfriend Claire Nunez. Jim is wounded during the fight while his best friend Toby Domzaski accidentally snaps the train's brakes, causing the train to be unable to stop, and complicating things for Prince Krel Taron, Steve Palchuck and Stuart as they are tasked to use 'trifurcate radiation' to negate the wizards' magic. The subway then breaks out of the station and almost collides into a shop in the city's square, narrowly avoiding the crowd. Then, Belloc and Skreal start a fire, with innocent civilians at risk. They threaten the lives of the bystanders unless Nari comes with them. Douxie has a genius idea, and swaps his mind with Nari's. It ultimately ends in the Arcane Order capturing Nari, unaware that Douxie swapped minds with her prior to her capture, the group being detained by the police before they escape. Jim recovers in a newly rebuilt Camelot while learning his mother Barbara is engaged to his former teacher and principal, the changeling Strickler. The group are then joined by Queen Aja Tarron and matured Eli Pepperjack, Steven unknowingly made himself pregnant when he kissed Aja for the seventh time. Blinky Galadrigal relays what he learned to reveal the Order's plan to awakening the Titans and have them converge at Arcadia Oaks, the center of the universe, to unite and recreate the world by destroying the current one. At that time, the Order discovers Douxie's spell and reverts the two back to their normal bodies, but not before Nari alerts Jim, "Trollhunter make the ninth configuration, Krohnisfere will make right". The heroes enter the Round Table and discover that the Arcane Order is already preparing a ritual to break the Genesis Seals. The heroes fail to prevent the ritual from carried out with each member of the order piloting their respective titan. The heroes split up: Claire, Blinky, Douxie's familiar Archie, and Archie's father Charlemagne head to the
Hong Kong Trollmarket in Hong Kong to acquire the Krohnisfere from the TrollDragon Zong-Shi; Krel leads Stuart, Steve, and Eli to retrieve
Excalibur, while the rest split into two teams in an attempt to stop the titans of Skreal and a brainwashed Nari. Nomura's team goes to tropical
Brazil while Strickler's team heads to icy
Greenland. But it ends with Strickler and his fellow changeling Nomura killed in battle while Claire's team manages to acquire the Krohnisfere, but are forced to leave Archie and his father behind when Belloc's titan destroys the bridge while defeating Varvatos Vex in a gigantic robotic suit of the fictional Gun Robot. The heroes reunite and Douxie restores Nari's freewill. When asked of the Krohnisfere, Nari tells Jim that "Time unfolds differently, like a flower. Only the Trollhunter will know" before using her Titan to battle and kill Skrael in his Titan, killing herself as well. As Belloc's titan continues its advance, Douxie realizes the Titans are meant to join with a Heartstone and that the union of Trollmarket's Heartstone and Bellroc's Titan will cause the world to be reborn in fire. The group arrive ahead of Belloc while Jim realizes that the ninth configuration is meant to represent him and his friends, enabling Jim to finally pull Excalibur out of the stone. The heroes come face to face with Bellroc, who proves to be too powerful for them to handle. As Jim is left alone to face Bellroc, he comes to accept that the amulet never made him a hero and he already was one. Jim's newly improved amulet (created with Akiridion technology, from the original blueprints from which Merlin had used when he first built the amulet and the hilt stone from Excalibur) begins to respond to Jim and flies towards him, giving him a magic/Akiridion armor which can empower Excalibur with greater power. Toby, after remembering the anti-magic radiation generator from their first encounter with the Arcane Order, uses it on Bellroc, giving Jim the opportunity to strike Bellroc with Excalibur. Jim finds a fatally hurt Toby, who has been crushed by debris and thanks his friends in his final moments with remaining eight heroes left to mourn him. Remembering Nari's words and realizing that the Krohnisfere is meant for him to
travel back in time and prevent any tragic events that happened to him and his dearest of friends, Jim decides to use to return to when he first became the Trollhunter. He gives an emotional farewell and his consciousness and memories travels back to the morning where he found the mystical amulet, making his first change to the timeline by having Toby find Merlin's amulet under the canals. == Cast ==