Dragons: Dawn Of Destruction

Shell Shocked

After months of planning, Hiccup has come up with a fool-proof plan to defeat Viggo once and for all and finally reclaim the Dragon Eye. The riders and their allies storm his base, only to find it in ruins along with an injured Viggo. He reveals that Ryker has taken charge of the Hunters and offers to surrender the Dragon Eye in return for Hiccup's help in stopping Ryker, but escapes during an attack on the Defenders of the Wing, leaving the riders with the baby Eruptodon in their care.

When the riders find Ryker, he tells them that Viggo is setting them up and he can give them the Dragon Eye as the Berserkers are attacked by the Shell Fire, a giant sea dragon equipped with Hunter weaponry. Just as Hiccup is left without any ideas on what to do, who to trust, or even how to handle his developing feelings for Astrid in the midst of growing danger, Viggo returns and offers the Dragon Eye as proof of his word and offers an equal alliance to bring Ryker down.  

Even with the Eye returned, Hiccup and the others still refuse to trust Viggo and imprison him just as Ryker arrives with the Hunters' fleet. The riders find out the Hunters are forcing the Shell Fire to attack but are unable to get close as the attacks trigger the Edge's volcano. Hiccup rescues Viggo from his burning cell and agrees to work together to stop Ryker by using the Submaripper, the Shell Fire's natural enemy, to destroy the fleet while the Defenders' baby Eruptodon helps control the volcano's lava flow.

The Shell Fire is freed and Ryker is consumed with the fleet by the Submaripper, while Viggo turns on Hiccup threatening to kill Astrid in exchange for the Dragon Eye, but Hiccup throws the Eye into the volcano and Viggo rushes to his doom chasing after it. Hiccup and Astrid realize their relationship compromises their mission and promise to remain professional as the other riders finally learn their secret cementing their relationship. Just as they leave, however, the volcano erupts.