Eastern Caverns Slugterra : Season 4 Episode 8

Eli and the Shane Gang accompany Junjie to his home in the strange and beautiful Eastern Caverns. But the sinister Emperor and his henchmen have pillaged every cavern of its slugs, and without the slugs' energy, the Eastern Caverns have grown dark and dangerous. Junjie is determined to rescue the slugs, save his homeland, and redeem the legacy he left behind while under the Emperor’s control as the Dark Slinger—and with Eli and the gang at his side, he will not have to do it alone.