Guest Stars
Steve Alterman
voices Additional Voices
Mae Whitman
voices Heather
Mitch Carter
voices Additional Voices
David Faustino
voices Dagur
Nolan North
voices Stoick Haddock
Chris Edgerly
voices Gobber
Alfred Molina
voices Viggo Grimborn
Alan Shearman
voices Additional Voices
David Tennant
voices Spitelout Jorgenson
Adelaide Kane
voices Mala
James Arnold Taylor
voices Throk
Julie Falls
voices Additional Voices
Lucas Grabeel
voices Gustav Larsen
