To master the mysterious slugslinging art of Slug Fu, Eli must train alone with Junjie. That means leaving behind the rest of the Shane Gang—as well as all of Eli’s slugs, and the ultrapowerful Elementals! Pronto vows to keep the Elementals safe, but proves so annoying that they run—er, hop—away! As Kord, Trixie and Pronto struggle to keep the wily Elemental Slugs out of the wrong hands, Eli and Junjie’s Slug Fu training is cut short by a madman with a plan to reduce Slugterra’s 99 caverns to rubble!

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Eli Shane is determined to be the greatest Slugslinging hero of all. But in order to defeat the forces of evil, he must collect, train and duel with little critters called slugs, which transform into powerful magical beasts. Eli and his crew explore the caverns, challenge rivals and one another to friendly duels, and upgrade their gear in their underground world. But there is a threat to Eli and the slugs Dr. Blakk wants to transform the slugs into feral mindless weapons. No one has been able to stand up to Blakk's army of henchmen ... until now.