During an expedition, four young dragon trainers uncover hidden Realms and must keep this secret from mankind. In the third and fourth seasons of "Dragons: The Nine Realms" (2022), Tom, an descendant of dragon trainers, ventures into the fire realm using a malfunctioning fire suit. With the help of friends, Tom faces challenges with a fire dragon, leading to newfound trust and friendship. When a dragon from the crystal realm is stranded in the fire realm, Tom and Jun come to the rescue, facing dangers and injuries. Ultimately, they work together to protect each other and return home safely, overcoming obstacles and strengthening their bonds.