Cast Out, Part 2

Cast Out Part II is the 20th and final episode of Dragons: Defenders of Berk.

Overview
Hiccup cautiously accepts Alvin the Treacherous's help on a mission to rescue Stoick from Dagur the Deranged's clutches. The dragon riders, the Berserkers and the Screaming Death all converge on Outcast Island for a war that may decide the fate of the entire Barbaric Archipelago.

Trivia

 * In this episode, we may see a more violent, out-of-character side of Hiccup while he tries to save Stoick from Dagur.
 * Alvin's Whispering Death returns in this episode along with his mate who is the reason for all the eggs planted under Berk in episode 1.
 * This episode is the only one in the second season where Hiccup gives any narration.
 * The Screaming Death was revealed to be looking for his mother and finally found her, thanks to Hiccup.
 * The Screaming Death and all the hatchling Whispering Deaths from Live and Let Fly and Tunnel Vision are revealed to be siblings, having all been laid by the same mother.
 * Stoick and Alvin become friends again and end their enmity. Snotlout and Hiccup also make amends, with Hiccup learning that sometimes, Snotlout's recklessness only stems from him being courageous.
 * Mildew is shown to still be loyal and faithful to Alvin, guarding the secret tunnel and watching the dragons.
 * It is revealed by Gobber that Stoick struggled when he first became chief, and there were people who didn't think he had it in him, similar to his son, Hiccup.
 * Fishlegs suggested and lured the Screaming Death to Outcast Island using Dragon Root.
 * This is the second time Hiccup and Toothless were briefly caught and captured by Dagur. The first time was in The Flight Stuff.
 * Like the previous episode, this one is similar to How to Steal a Dragon's Sword. With Stoick missing, Hiccup becomes temporary chief, which he struggles with. He is also giving a difficult choice to rescue his father. The secret underwater tunnel is also similar to the hidden maze under Flashburn's school.
 * Snotlout momentarily trying to take charge as chief is just like his book counterpart.
 * Hiccup uses air mail to tell the riders on Berk to lure the Screaming Death to Outcast Island.
 * Fishlegs recalls to the riders that not all dragons are effected by Dragon Root. He gives an example of Meatlug being a boulder class dragon yet not being effected by the dragon root. However, one would consider the Screaming Death to be a boulder class dragon. Yet it is effected by dragon root. This is probably because a Gronckle's main diet is rock while the Screaming Death eats fish as shown at the end of Tunnel Vision.