<Tr> <Td_colspan="6"> After Johann believes he has found the location of a Dragon Eye lens in a cave, he sends Viggo in to find it . While down there, Johann and Krogan decide that Viggo is no longer useful and collapse the cave entrance leaving him trapped with a Monstrous Nightmare . Later, Hiccup receives a Terror Mail supposedly from Stoick saying that he has found a Dragon Eye lens and to meet him alone . When he arrives, he realizes that Viggo is the one who sent the message and Viggo tells the story of his betrayal and asks for Hiccup's help . Hiccup refuses, but Viggo reveals that he has poisoned Toothless with Red Oleander, and that Toothless will die in three days if they do not recover an antidote from Johann . Using a Skrill as a diversion, Hiccup and Viggo enter their headquarters where Viggo betrays Hiccup to earn favor with Johann and Krogan once more . However, this is all part of their plan and Hiccup and Toothless escape their cell and rendezvous in Johann's Quarters, only to discover that Johann had moved the Dragon Eye to another location . Johann and Krogan realize Viggo's deception and a fight ensues, resulting in Viggo sustaining lethal injuries before rescuing the Skrill and reuniting with Hiccup . Viggo reveals that Red Oleander is not harmful to dragons and that he had no intention of poisoning Toothless, having developed a deep respect for dragons after a Monstrous Nightmare saved him from the cave in . He stays behind to fight off Johann's men with the Skrill, giving Hiccup and Toothless time to escape . </Td> </Tr> <Tr> <Th> 114 </Th> <Td> 9 </Td> <Td> "Family Matters" </Td> <Td> T.J. Sullivan </Td> <Td> Jack Thomas </Td> <Td> February 16, 2018 (2018 - 02 - 16) </Td> </Tr> <Tr> <Td_colspan="6"> After a battle with the Flyers, the Riders discover remnants of Deathsong amber underneath a Singetail's wing, leading them to deduce that Krogan is using a Deathsong to lure and capture Singetails for his Flyers . Worried, the Riders quickly check on Garffiljorg while the others take the injured Singetail back to the Edge for recovery . They discover Garff safe and unharmed, but decide that they must liberate the Deathsong and cut off Krogan's supply of Singetails . Despite Hiccup's orders, Astrid allows Garff to accompany them back to the Edge and to rescue Krogan's Deathsong . Seeing their fortification, they decide to return with reinforcements, but Garff flies in to help the Deathsong upon hearing its cries, resulting in his capture . Meanwhile, the wounded Singetail wakes up on the Edge and despite Fishlegs' attempts to care for it, it escapes and Fishlegs and Meatlug follow it . After making a plan, they release the captive Singetails only to find the dragons turning on them and forcing the riders to fall back in a cave with no escape . While following the wounded Singetail to the same island, Fishlegs find a hatchery of Singetail eggs and realizes that the Flyers are breeding Singetails . In the cave, Hiccups finds Garff while Fishlegs brings the Cavern Crasher to help dig a new exit and move the Singetail eggs to safety . Once out of the cave, the Riders destroy the Flyers' facilities and free the Singetails . </Td> </Tr> <Tr> <Th> 115 </Th> <Td> 10 </Td> <Td> "Darkest Night" </Td> <Td> Greg Rankin </Td> <Td> Art Brown & Douglas Sloan </Td> <Td> February 16, 2018 (2018 - 02 - 16) </Td> </Tr>

Dragons race to the edge season 4 episode 16