As the Shane Gang return to the 99 caverns from their Eastern adventure, a dispute erupts between them and the Shadow Clan, threatening to shatter the hardwon peace in Slugterra. Eli and the Gang have their hands full dealing with the antics of the usual thugs, plus growing hostility from their former allies. So when Tad and his slug Pieper—who have just arrived from the Surface—lend a hand with Pieper’s amazing powers, Eli welcomes a new team member. But soon this newcomer casts his own shadow on the chaos.

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Eli Shane is determined to be the greatest Slugslinging hero of them all! Only by collecting, training and dueling with little critters called SLUGS can Eli and his team hope to defeat the forces of evil. Did we mention the part where the slugs transform into powerful magical beasts? Slugterra is an epic scifi comedy adventure set deep underground, where the ammo's alive and only the quick survive! In this luminous, hightech, underground world every cavern holds a new adventure, new battle and weird little slugs to be discovered! The story follows Eli and his crew as they explore the caverns, challenge rivals and each other to friendly duels, upgrade their cool gear, and generally have a blast in this neverbeforeimagined underground world! But there is a very real threat to the world and the slugs; Dr. Blakk is seeking to "ghoul" the slugs, transforming them into feral mindless weapons! No one has been able to stand up to Blakk's powerful slugs and army of henchmen... until now.