The riders are tracking Jörmungandr but are ambushed by it and can only escape after Wu's and Wei's fire and ice breath collide with Jömungandr's breath to create a thick cloud of smoke. This, however, leaves the dragons posioned, though not fatally, and weakened. At night, Tom looks through the Book of Dragons and discovers that Hiccup used Valka's staff to hypnotize and imprison Jörmungandr. He reclaims the staff and, after some training, manages to figure out how to use it. When confronting Jörmungandr alone, despite having promised Jun not to, he manages to get it to the gate. But Jörmungadr breaks the staff before Tom can lock it up again. The other riders arrive and they manage to escape. But Jun, being hurt that Tom broke his promise to her as well as putting himself in serious danger, breaks up with him.
Tropes in this episode include:
- Ancestral Weapon: Tom retrieves the staff which belonged to his viking ancestor Valka and uses it throughout the episode.
- Breath Weapon: Jörmungandr breaths out poisonus, light blue smoke that severly weakens anyone who inhales it.
- Brutal Honesty: When Eugene is caught by Tom mocking him, he straight up tells him he was mocking him.
- The Cameo:
- Valka gets both namedropped and shown in a page of the Book of Dragons alongside her Bewilderbeast.
- During a flashback, Hiccup is shown imprisoning Jörmungandr.note He and Toothless are then shown on a page of the Book of Dragons.
- Death Glare: Tom gives one to Eugene after discovering him mockingly imitating his attempts to figure out Valka's staff.
- Disapproving Look: Following Tom leaving frustrated after Eugene mocked his attempts to figure out how to use Valka's staff, Jun, Alex and Thunder give Eugene one before following Tom to cheer him up.
- Downer Ending: Valka's staff is destroyed and Jun breaks up with Tom.
- Enemy Rising Behind: As the riders prepare to ambush Jörmungandr, Alex suddenldy lose it on her tracker pad. Moments later, its shadow is seen rising up behind them with its breath eventually alerting the riders to its presence.
- Flashback: While Jun is reading Hiccup's notes on how he imprisoned Jörmungandr from the Book of Dragons, the audience is given one showing Hiccup doing it.
- Gone Horribly Wrong: Tom trying to imprison Jörmungandr on his own breaking his promise to Jun not to try it alone results in the staff being broken and Jun, hurt by Tom breaking his promise, breaking up with him.
- Make Up or Break Up: Having broken his promise to her to not engage Jörmungandr alone, Jun is so hurt that she breaks up with Tom.
- Mass Hypnosis: As he gets the hang of using Valka's staff, Tom manages to hypnotize a group of Woodchippers as well as three Terrible Terrors.
- Nice Job Breaking It, Hero: Tom trying to imprison Jörmungandr again single-handedly resulted in Valka's staff being broken and Jun, hurt that Tom broke his promise to her and put himself in life-threatening danger, breaks up with him.
- The Promise: After mastering Valka's staff enough to hypnotize friendly dragons, Jun makes Tom promise not to go after Jörmungandr on his own. However, when Tom and Thunder evacuate the Nature Realm due to Jörmungandr attacking it, the Apex Predator appears and Tom, rather than fleeing, decides to break his promise and attempts to imprison it on his own. This backfires horribly, however, as the staff ends up destroyed and Jun, hurt Tom broke his promise, breaks up with him.
- The Reveal:
- Tom confirms the Sky Torcher survived the Season 7 finale.
- Hiccup is revealed to have defeated Jörmungandr by hypnotizing it using Valka's staff.
- Right Behind Me: When Eugene makes fun of Tom's attempts to figure out how to work the staff by mockingly imitating him, Jun asks Eugene whether he knows Tom can see him. Eugene turns around to Tom standing behind him giving him a Death Glare. A minor Oh, Crap! moment ensues before Eugene straight up tells him he was mocking him.
- Shout-Out: Jun say that Jörmungandr is supposed to bring the end of the world. In Norse Mythology, he plays a big part in Ragnarök, the end of the world.
- Smoke Out: The riders escape through the smoke created by Wu's and Wei's fire and ice breath colliding with Jörmungandr's poisonous smoke.
- Solemn Ending Theme: Following Jun breaking up with Tom, the sad music which played during the break-up scene continues playing as the credits roll.
- Training Montage: There are two montages of Tom training with the staff: The first sees him trying and failing to get the staff to work. The second one shows him gradually succeeding in mastering the staff.
- What the Hell, Hero?: Jun calls out Tom for breaking his promise to her to not go after Jörmungandr alone and putting himself in danger. She proceeds to break up with him.
- Won't Get Fooled Again: When Tom manages to get Jörmungandr to the gate of its prison using Valka's staff, his fragile control over the Apex Predator slips as it recognizes Tom doing the exact same thing Hiccup did to imprison it and attacks Tom, stealing and subsequently breaking the staff.
