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In "Team Astrid", Spitelout took Kingstail the deadly nadder as his dragon following when he joined the Dragon Riders' Auxilary after Dagur's attack on Berk. Kingstail then helped defend Dragon's Edge.
During the events of "Snotlout Gets the Axe", Kingstail then assisted Spitelout in delivering the Jorgenson Ceremonial Axe to Snotlout, Astrid and Hiccup. He also assisted Spitelout with preparing for a wedding between the Jorgensons and the Hoffersons on the Island of Friga. Kingstail helped Spitelout return the boars when the wedding fell apart.
Kingstail is blue with a pale underbelly and an orange snout, wings and thighs.
Kingstail is shown to get along with Spitelout.
- Kingstail's coloration is somewhat similar to that of Flystorm.