With Dragons now known to all of ICARIS, Tom is overwhelmed with taking care of all dragon problems by himself and the adults don't trust the other riders to help. When a swarm of dragons invade ICARIS, Tom investigates the source while the others contain the dragons. Tom discovers that a trio of rampaging Nadders are driving the other dragons out of their home and struggles to calm them down. The other riders manage to prove themselves to the adults by corralling the dragons using the greatest
While the adults leave for a work seminar, Eugene tries to throw a party with the dragons against the objections of D'Angelo, who was trusted by his father to keep things under control. Things get out of control when D'Angelo and Eugene get trapped in the ICARIS hangar and can't get out without alerting their parents. In the end, the riders get everything back to normal and Eugene takes the blame for all the trouble to avoid getting D'Angelo in trouble.
Jun attempts to get her mother to let her contribute to the study of dragons but fails to get her attention. Sledkin offers sympathy to Jun and convinces her to let the riders take her into the Hidden World, against Tom's wishes. Suspicious of Sledkin, Tom, Alex, and Eugene sneak into Sledkin's office and discover she has been stealing Dragonsite, but Jun doesn't believe them thinking Sledkin is the first adult to value her contributions. That night, something agitates the dragons, and the rider
While having some fun of the slopes of the Ice Realm, Webmaster and Eugene stumble upon a gateway that leads to a sixth realm, where everything is Giant. Their time to explore is short lived though as they come across a pack of Deathgrippers who have the ability to mind control Dragons through a single sting. When Webmaster get stung by them, Eugene goes after his dragon and eventually manages to use their bond to snap him out of the venom's mind control. After the Deathgrippers are eaten by a m
Sledkin is put on suspension for her previous unauthorized and unethical experiments, much to the joy of the dragon riders. Soon after, the riders discover human explosives were set off in the Nature Realm and injured a Cavern Crasher. D'Angelo treats the dragons wounds and the riders suspect Sledkin, but she has the alibi of not leaving her house since she was on suspension. The riders then suspect Buzzsaw, but he is proven innocent when another explosion goes off while they confront him. When
When Buzzsaw sets his eyes on stealing the Book of Dragons, he poisons the Thunder with darts and gives them until sundown to exchange the book for the antitode. D'Angelo realizes there might be a cure when a Hobgobbler proves immune to the poison and believes it could be the flowers it eats. The riders find the flowers, but when they don't cure Thunder, Tom reluctantly takes the book to exchange for the antidote. Buzzsaw doublecrosses Tom and reveals there was never an antidote, but D'Angelo is
With the information from the book's illustrations, Buzzsaw is able to capture a new dragon called an Octo Fin from an ocean in the giant realm. The riders interfere with his plan, causing Buzzsaw to drop the tied-up dragon into the ocean, forcing the riders to steal the ICARIS bathysphere to lower themselves into the ocean to save it. The rescue is complicated by a territorial Shellfire causing the bathysphere to malfunction. Tom risks his life to free the Octo Fin and the dragon returns the fa