When the Shane Gang arrive at a cavern overrun by thieves terrorizing the good townfolk, they decide to use Pronto as bait, hoping the thieves will eliminate each other as each strives to be the first to capture the valuable molenoid—the only one the Eastern Caverns have ever seen. However, their plan goes awry when Underlord Holt arrives and commands the thieves to work together to bring him Pronto—dead or alive!

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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.