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 aided Spitelout in carrying out Hiccup's plan to overtake Viggo's base and take the Dragon Eye back, only to find Viggo was a step ahead of them again and the plan failed. The Auxiliary Riders were sent back home to Berk after that, along with Kingstail and Spitelout.
Kingstail is blue with a pale underbelly and an orange snout, wings and thighs.