Dragons: Riders of Berk Season 7 Episode 10 - No Dragon Left Behind Episode Title:No Dragon Left Behind.Episode Description:Garff's predatory instincts begin to emerge as the Riders are in the middle of repairs, convincing them that now may be a good time to find him a new home. Fishlegs believes he has found the perfect candidate, but it turns out to be home to Slitherwings, venomous serpentine dragons that poison Stormfly as she defends Garff to trigger strange wild behavior. Though Astrid is poisoned herself to gather the venom needed for the antidote, it proves ineffective on Stormfly, which turns out to be due to her never being poisoned and instead is grieving over the loss of Garff. The Deathsong is soon revealed to be alive and gains the chance to escape with the Riders thanks to Stormfly's new blinding light shot, and the Riders find him a more suitable home.