Tom and Jun encounter unexpected dangers and are separated while exploring the Hidden Realm of dragons. Tom introduces Jun to the dragon world, and Jun bonds with a dragon of her own – Wu and Wei.

Tom and Jun take a risk in revealing the secret of the Hidden Realm to D'Angelo to aid an injured dragon, and D'Angelo bonds with Plowhorn.

Tom and the others debate how to keep the dragons a secret, even as a rambunctious young "cloaking" dragon gets loose in town and pursues a friendship with a reluctant Alex.