The Dragon riders enlist the aid of Carla and Hazel and their scientific knowledge to help them prepare for a mission to neutralise Jörmungandr so they can return him to his chamber and seal him back inside.
Tom's overconfidence turns to frustration then despair as he struggles to procure the ingredients for Gronckle Iron in hopes of building a trap to stop the World Serpent.
After a major miscalculation by Tom leaves the fate of the realms in jeopardy, Jun and the riders rally behind Tom and Thunder to face off against the World Serpent.
