Things have changed in the five years that have passed since Will Shane's disappearance. Without their protector, the 99 Caverns are becoming more and more dangerous. Blakk Industries is slowly taking over the realm's slugs and industry. Doctor Blakk seems bent on ruling the realm. Without her guardian, Alana's been living with only the company of her slugs. Determined to keep a positive view on her life, she's focused on training to become the slugslinger that Will would have helped her be, despite wondering about herself and her strange new abilities that are appearing. But when Will's son takes the Drop to Slugterra, Alana has to put her own life on hold to help save her home.

Y/N L/N doesn't know much about his family or where he came from. All he knows is that he's lived in New York all his life, fighting and stealing to survive. One day he witnesses a fight between a hero and a villain. He suddenly finds himself rushing out to stop the heroes death only to learn a secret he was never supposed to know about.