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Heather's betrayal to Berk caused the Book of Dragons to fall into Alvin the Treacherous' hands, and Heather's imprisonment on Berk. In order to get the book back from Alvin, Astrid disguises herself as Heather and goes into Outcast Territory. Towards the end of her mission, Astrid learns and confirms Heather's true motives for helping the Outcasts.
Episodes
1How to Start a Dragon Academy 2Viking for Hire 3Animal House 4The Terrible Twos 5In Dragons We Trust 6Alvin and the Outcasts 7How to Pick Your Dragon 8Portrait of Hiccup as a Buff Man 9Dragon Flower 10Heather Report (1) 11Heather Report (2) 12Thawfest 13When Lightning Strikes 14What Flies Beneath 15Twinsanity 16Defiant One 17Breakneck Bog 18Gem of a Different Color 19We Are Family (1) 20We Are Family (2)