Episode Title:Undertow.Episode Description:While riding through the mystifying Flumes, a river that flows beneath Slugterra, the Shane Gang end up in Undertow, a water filled cavern. Before they can relax they run into Pirate Captain Malvolio Drake, Master of the Cavern Seas. The Shane Gang gets captured and have to rely on Dr. Blakk's men to break them out. They manage to out pirate Drake and his Mimkey Slug, a slug that perfectly mimics anything another slug slung at it can do. Eli liberates all of Drake's captured slugs and return them back to their rightful owners.