Slugterra: Return of the Elementals
Junjie (Previously the Dark Slinger from Slugterra: Ghoul from Beyond) joins the Shane Gang. They must stop an evil alliance led by the Goon Doc from Slugterra: Ghoul From Beyond from finding the four ancient elemental slugs—earth, air, fire, and water—which Goon Doc could use to destroy the 99 caverns.