The Longest Day
- एपिसोड aired 17 फ़र॰ 2017
- TV-Y7
- 22 मि
अपनी भाषा में प्लॉट जोड़ेंDuring the week of the Midnight Sun where the sun doesn't set for a week, Hiccup must deal with sleep deprivation and a dangerous new dragon.During the week of the Midnight Sun where the sun doesn't set for a week, Hiccup must deal with sleep deprivation and a dangerous new dragon.During the week of the Midnight Sun where the sun doesn't set for a week, Hiccup must deal with sleep deprivation and a dangerous new dragon.