Tyrannis invites a suicidal Hydra to come live with him and his family. Everyone grows to love her, but Tyrannis comes to regret his decision when she accidentally embroils Krapopolis in chaos.

Tyrannis and Deliria go up north to find the dragon that is causing a plague; but when Deliria is infected with it, Ty must save his kingdom and his mom. Meanwhile, Hippo works on a cure to save the infected Krapopolis residents.