Rex contends with his evil stepmother while he searches for a way to prove his father's innocence after his father is locked away in an asylum located on an island in the middle of a frozen lake that is rumored to be inhabited by a monster.
Naomi Martinez has been estranged from her family for years but is determined to bridge the gap between her and her father so that her son can finally know his grandfather.
Sixteen years after Hari and Pearl defeated the tyrant Ottmar, their children Xantee and Lo face an even more dangerous foe which they must find and destroy if they are to save their father and the world they know.