In his father's stories, the world beneath our feet had so much more to fight for, and every bone in Eli Shane's body tells him his father is right. Deep within the heart of Eli Shane lies the light needed to combat the oncoming darkness that threatens the magic in Slugterra. To unite the people that reside in these caverns, to be the spark that ignites the flame of revolution, that awakens the voices within Slugterra, Eli must guard Slugterra and it's inhabitants from eventual disaster and authority. But he isn't the only one that will fight back, and he certainly isn't alone.