Tunnel Vision Dragons: Riders of Berk : Season 2 Episode 4
TV-Y7 (Universal Kids) Cartoon Network 22m
Aired: October 10th, 2013 @ 2:00 AM EST on Cartoon Network
Hiccup discovers that the town's water shortage has been caused by the Outcasts' plan to hide Whispering Death eggs under Berk, which soon hatch and tunnel under the island, threatening the villagers.
