Slugterra: Return of the Elementals (2014)

In Slugterra: Return of the Elementals, a new member joins the Shane Gang. Junjie is a master of the mysterious slugslinging art of Slug Fu. But even with the power of five slugslingers working together, the Shane Gang find themselves in over their heads as they race to protect the ancient Elemental Slugs from an evil alliance set on using them to destroy the 99 caverns.