After being captured, Hiccup discovers that Mildew has joined the Outcasts. However, Mildew is also imprisoned when he's no longer of any use to Alvin now that he has Hiccup. Hiccup reluctantly allows Mildew to help him find Toothless and escape Outcast Island, a final test for Mildew's loyalty to Berk. After Hiccup and Toothless escape, Mildew betrays the Dragon Riders, revealing that Mildew's imprisonment has also been a trick, allowing Alvin to train a Whispering Death.
Guest Cast

Stephen Root
voices Mildew
Mark Hamill
voices Alvin
Michael Goldstrom
voices Trader Johann
Brook Chalmers
voices Outcast Guard
Brook Chalmers
voices Outcast SoldierCast Appearances

Jay Baruchel
voices Hiccup Haddock
America Ferrera
voices Astrid Hofferson
T.J. Miller
voices Tuffnut Thorston
Julie Marcus
voices Ruffnut Thorston
Zack Pearlman
voices Snotlout Jorgenson
Chris Edgerly
voices Gobber
Nolan North
voices Stoick HaddockEpisode Discussion
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