A betrayal reveals the true purpose of the mission. Determined to perform the ritual at any cost, Rezaren turns to a dark power for help.
When the Eruptodon can’t take its egg into the Great Volcano, Hiccup and Fishlegs must go into the dangerous volcano with the egg before it’s too late.
Viggo gets angry at the dragon riders continually interfering with his business and uses a deep sea dragon, the Submaripper, to control Berk’s trade.
