Dragons: Race to the Edge
This Flightmare lived somewhere near Dragon's Edge, possibly on Algae Island. Heather tracked it for months, before she pretended to join Dragon Hunters. When Viggo wanted to capture it, Heather gave him the information and later made an ambush plan with Hiccup Horrendous Haddock III.
Hiccup had a plan to lure the Flightmare onto Viggo's ship by throwing the glowing algae on it, and it worked at first, but soon the Hunters captured it and muzzled it.
Viggo then used the Flightmare to freeze Hiccup and Toothless, unlock the Dragon Eye and as a distraction for his escape. Later the Flightmare was released and it flew to an unknown place.
This Flightmare appears to be more aggressive, territorial and intelligent, as it attacked the Hunters, regardless of the consequences, and it sprayed Ruff and Tuff with algae to look at them as food. Also, it chased them around the island while shooting mist, not waiting for a direct hit.
Glow: Like all Flightmares, this dragon glows when it eats certain glowing algae.
Shooting Mist while Flying: Like all Flightmares, this dragon can shoot mist. However, this individual has perhaps developed a strategy for attack, flying around while its mouth was open, leaving a trail of mist in the air as it chased Ruffnut and Tuffnut.
Hiccup Horrendous Haddock III: Although it didn't spend much time around him, it was shown that it is very aggressive towards him and tried to attack him multiple times.
Viggo Grimborn: After Ryker put the bucket with algae in front of the cage, Viggo pushed it inside, allowing the Flightmare to eat. He said that it must be treated with respect, although he obviously didn't mean that, especially when he muzzled it and used it's mist to unlock the Dragon Eye. The Flightmare appeared enraged at Viggo, as it roared at him after he gave it the bucket and narrowed its eyes at him.
- It is possible that this Flightmare is actually the Hofferson's Bane, as it was never revealed where it went after Fright of Passage.
- This Flightmare doesn't have pupils in its eyes, unlike the Hofferson's Bane, who does have pupils.
- Viggo's Flightmare seems to have several purple spots on its wings, unlike Hofferson's Bane, which is entirely in shades of blue.