Marielle Grey has grown up in Slugterra. As the only daughter of Hannah Grey, famed slugslinger and protector Will Shane's second-in-command, Mari has quite the legacy to live up to. But, after Will Shane disappears while fighting the nefarious Dr. Blakk when Mari is thirteen, and her mother retires early, the world she had known her entire life is forever changed.
Five years later, Will's son Eli shows up in the 99 Caverns, picking up where his father left off and vowing to defeat Dr. Blakk whatever it takes. But, with Blakk corrupting the energy of Slugterra's native mollusks and turning them into terrifying and warped Ghouls, Mari knows that Eli, whom she had communicated and gotten to know through letters delivered by Will Shane until he disappeared, may just be the only one who is able to save her world.
[Slugterra]
[Season 1-4, plus movies]
[Eli Shane x OFC]
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.