Hiccup and friends accompany their mentor, Gobber, on a quest to kill the legendary Boneknapper Dragon.
| Actor | Role |
|---|---|
 Jay BaruchelHiccup Horrendous Haddock III (voice) | Hiccup Horrendous Haddock III (voice) |
 Gerard ButlerStoick (voice) | Stoick (voice) |
 Craig FergusonGobber (voice) | Gobber (voice) |
 America FerreraAstrid Hofferson (voice) | Astrid Hofferson (voice) |
 Jonah HillSnotlout Jorgenson (voice) | Snotlout Jorgenson (voice) |
 Christopher Mintz-PlasseFishlegs Ingerman (voice) | Fishlegs Ingerman (voice) |
 T.J. MillerTuffnut Thorston (voice) | Tuffnut Thorston (voice) |
 Kristen WiigRuffnut Thorston (voice) | Ruffnut Thorston (voice) |
 John DiMaggioGobber's Father (voice) | Gobber's Father (voice) |
 Kevin Michael RichardsonThor (voice) | Thor (voice) |