Danny Dragonbreath and his friend Wendell get an up-close underwater tour of the Sargasso Sea from Danny's sea-serpent cousin, encountering giant squid and mako sharks--and learn about standing up to bullies in the process.
When Danny and Wendell find an injured bat at the neighborhood pool, they take it to Mexico where Danny's cousin, a bat specialist lives, but once there Danny is snatched up by a giant bat monster, and it is up to Wendell to save him.
Wendell the iguana's dreams are all nightmares and a Dream Wasp wants him as a host for her eggs--so, with Great-grandfather Dragonbreath's help, Danny the dragon and Suki the salamander enter Wendell's dreams to try and defeat the wasp.
Not only must Danny and Wendell trick-or-treat with skeptical classmate Christiana, school bully Big Eddy dares them to enter a haunted house on Halloween night, where they may have to sacrifice their candy to a ghost.
Danny Dragonbreath is excited about going to camp with his best friend Wendell and classmate Christiana even though his obnoxious, seven-year-old cousin Spencer is going too, but things change when Spencer finds a real jackalope.
When little twelve-year-old Molly arrives at Castle Hangnail to fill the vacancy for a wicked witch, the minions who dwell there have no choice but to give her the job, and at first it seems she'll be able to keep the castle open, but Molly has quite a few secrets that could cause trouble.