Toby's grandfather has always said, "A child's imagination is the greatest superpower of all." is is the reason that for over one hundred generations, select groups of kids have secretly helped protect the world. Now, on the first day of summer vacation, eleven-year-old Toby and four of his unsuspecting schoolmates are about to become The Young Defenders of our time.
Toby, Jessie, Griffin, Chen, and Aamira will discover that strange and wonderful secrets lie hidden all around to help them on their mission. But for any hope of success against Alchemist Supreme, the fiercest supervillain of all time, they must not only develop their superpowers but also realize the strengths that each has always had inside themselves.