With Garff becoming more and more predatory, the Riders decide to relocate him to a new safe home. However, trouble arises in the form of the highly venomous Slitherwings.
Tropes:
- Adaptive Ability: Because of her friendship with Garff, Stormfly is the only dragon unaffected by the Death Song's hypnotic properties.
- All for Nothing: Astrid getting herself poisoned so they could make an antidote ends up being pointless when they find out that Stormfly hadn't been poisoned in the first place.
- Call-Back: In the episode "When Darkness Falls", Snotlout is implied to be afraid of snakes. Here in this episode, he shows this fear again with the Slitherwings.
- Irony: The only house on Dragon's Edge that wasn't destroyed during the Flyers' assault was Ruffnut's and Tuffnut's, the most violent and needlessly destructive members of the group.
- Five Stages of Grief: Stormfly went through this after Garff vanished when the Slitherwings first appeared.
- Let's Duet: Whenever Tuffnut and Ruffnut talk to Garff, they break out into song.
- Mistaken for Dying: It turns out that Stormfly wasn't poisoned. She was just upset after thinking her friend had died.
- Nature Versus Nurture: The main drive that kicks off the episode is that Garff is misbehaving, nearly eating some of the dragons on the island as his instincts tell him to.
- Out-of-Character Moment: Snotlout has a rare moment of sincerity when he tells Hiccup that Stormfly's poisoning reminded him of when Hookfang became ill in "Race to Fireworm Island".
- Shown Their Work: In a distinction rarely acknowledged in fantasy fiction, the writers consistently refer to the dangerous substance the snake-like Slitherwings secrete through their skin as "poison", not "venom" (which only refers to something the carrier injects into the victim, such as through a bite).
