The heroes from the Trollhunters series team-up on an epic adventure to fight the Arcane Order for control over the magic that binds them all.
Arcadia Oaks may look like an ordinary town, but it lies at the center of magical and extraterrestrial lines that makes it a nexus for many battles among otherworldly creatures including trolls, aliens, and wizards. Now, the heroes from the hit series Trollhunters, 3Below, and Wizards team-up in their most epic adventure yet where they must fight the Arcane Order for control over the magic that binds them all together.
There is war between mankind and magic. Humans are allied with the peace seeking trolls against the evil trolls. Merlin is the mightiest wizard and forges a powerful weapon, the Trollhunter amulet. After millennium, the trolls are settled in Arcadia Oaks, underground. Troll Hunter Kanjigar was killed by an evil troll. Kanjigar's amulet falls into the hands of a human, James. James becomes the first human troll hunter. James and his friends have saved Arcadia and the world numerous times.But James was separated from the Amulet and the Amulet destroyed by the Arcade Order. Nari, who was a member of the Arcane Order, joins the good side and says that the Order is hunting for the Genesis seals.
Following the events of Wizards, master wizard Hisirdoux "Douxie" Casperan (Colin O'Donoghue) and former Arcane Order member Nari (Angel Lin) lure their pursuers Belloc (Piotr Michael) and Skrael (Piotr Michael) onto a moving subway train where they launch a surprise attack with former Trollhunter James "Jim" Lake Jr. (Emile Hirsch) and his girlfriend Claire Nunez (Lexi Medrano). Jim is wounded during the fight while his best friend Tobias "Toby" Domzalski (Charlie Saxton) accidentally snaps the train's brakes, causing the train to be unable to stop, and complicating things for Prince Krel Taron (Diego Luna), AAARRRGGHH!!! (Fred Tatasciore), Steve Palchuck (Steven Yeun) and Stuart (Nick Frost) as they are tasked to use 'trifurcate radiation' to negate the wizards' magic. It ultimately ends in the Arcane Order capturing Nari, unaware that Douxie swapped minds with her just prior to her capture, the group being detained by the police before they escape.
Nari, Bellroc and Skrael are the 3 super wizards who created everything in the universe. They are mad as the humans screwed up the planet.Jim recovers in a newly rebuilt Camelot while learning his mother Barbara (Amy Landecker) is engaged to his former teacher and principal, the changeling Walter Strickler (Jonathan Hyde). The group are then joined by Queen Aja Tarron (Tatiana Maslany) and matured Eli Pepperjack (Cole Sand), Steven unknowingly making himself pregnant when he kissed Aja for the seventh time. Blinky Galadrigal (Kelsey Grammer) 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. But they cant awaken the titans without Nari.
At that time, Order discovers Douxie's spell (when they cant open the Genisis seals to Awaken the titans in Nari's presence) and reverts the two back to their normal bodies, but not before Nari alerts Jim, "Trollhunter make the ninth configuration, Krohnisfere will make right". Jim's amulet has been fixed by Aja. The heroes enter the Round Table and discover that the Arcane Order is already preparing a ritual to break the Genesis Seals. The heroes reach the location of the ritual, but the Amulet won't work.The heroes fail to prevent the ritual from carried out with each member of the order piloting their respective titan. They will take 18 hrs to converge at Arcadia Oaks
Jim reckons that Amulet was made by Merlin and can be powered by only his magic. Since his staff is destroyed, only the Excalibur is the source of Merlin's magic now.The heroes split up: Claire, Blinky, Douxie's familiar Archie (the flying dragon-cat), and Archie's father Charlemagne (Brian Blessed) (the flying dragon-goat) head to the Hong Kong Trollmarket to acquire the Krohnisfere from the TrollDragon Zong-Shi (James Hong); 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.
But it ended with Strickler, and his fellow changeling Nomura (Lauren Tom) are killed in battle with the Titans, while Claire's team manages to acquire the Krohnisfere, but are forced to leave Archie (Alfred Molina) and his father behind when Belloc's titian destroys the bridge while defeating Varvatos Vex (Nick Offerman) in a gigantic robotic suit of the fictional Gun Robot. The heroes reunite and Douxie restores Nari's freewill, by decoupling her from her Titan.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 (Claire transported them via a portal to the exact location) and kill Skrael in his Titan, killing herself as well.
As Belloc's titan continues it advance, Blinky 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. If he goes back, he changes the time-line and perhaps saves all the lives that were lost fighting the trolls and the titans. He gives an emotional farewell and travels back to the morning where he found the mystical amulet, making his first change to the time-line by having Toby find Merlin's amulet under the canals.
