A winter-time holiday has arisen in the Eastern Caverns around the mysterious “Giver,” who makes an annual visit to deliver slugs to the people of the East. But when a group of thieves make off with the Giver’s precious cargo of slugs, the gang must ride to the rescue—and discover the secret of who the Giver really is.

A new member has joined Eli and the Shane Gang! Junjie, once the protector of the Eastern Caverns, is a master of the slugslinging art of Slug Fu! But even with the power of five slingers, the Shane Gang find themselves in over their heads as they race across the 99 caverns in search of the legendary Elemental Slugs. The five Elementals are ancient slugs of great power, and the forebearers of all slugs found in Slugterra today. In the wrong hands, they could bring Slugterra to the brink of destruction. So, when an evil alliance starts hunting down the Elementals, Eli and his friends — both old and new — take off in pursuit of the greatest threat their world has ever faced!

A short cut takes the Shane Gang through the territory of the Shadow Clan -- and try as they might not to, they are discovered and captured by the mysterious creatures. Just when it looks like our heroes are done for, they are helped out of this jam by a most unlikely savior.

When the hooligang enters the Quiet Lawn Cavern and think no one is tough enough to stand up to them, they get proven wrong by Eli and his gang.

After a wild ride on the mysterious Flumes, the Underriver that runs beneath all the Slugterra, the Shane gang find themselves dropped into a sea cavern, where they are promptly shanghaied into the crew of the Pirate Captain Malvolio Drake.

Junjie recounts the ancient history of the Eastern Caverns and his ancestors, and the events that led to his downfall and transformation from the Eastern Champion to the Dark Slinger.

When Pronto accidentally uses the Emperor's sword blaster, he can suddenly do no wrong. Meanwhile, Lady Dai-Fu manipulates Underlord Holt into trapping the Shane Gang with a new superweapon: the Iron Warrior!

The Emperor sets to work creating Unstoppable Warriors to reclaim the Eastern Caverns. To make things even more difficult, a bounty is placed on Junjie's head, sending the Dai-Fu and hordes of the Emperor's Underlords after the Shane Gang.

Junjie, Eli and the Gang rally their friends in the Eastern Caverns—and even some of their old enemies—to help them take down the Emperor and all of his Unstoppable Warriors once and for all!

Tad's hypnotic slug Pieper has gone megamorph, his gang of supporters all have Gattler blasters and Tad's control over his new ghouls is stronger than Dr. Blakk's ever was. The Shane Gang are under non-stop ghoul fire as they struggle to put a stop to Tad's plans and the mass ghouling of slugs once and for all.

Eli wants to enter the Slug Run, despite being told he isn't experienced enough. He finds himself up against some tough opponents, including Vance Volt, who works for Blakk.

Long thought to be merely a legend, an Enigmo Slug has finally been spotted. The bidding is high for this, the rarest of all slugs, and so is the competition to be the first grab it! Eli and the gang actually beat Slugterra's most vicious slug hunter to the prize--only to find that the hunter is now hunting them!

Just when the evil Dr. Blakk has been defeated and it seems like Eli Shane’s duties as protector of Slugterra are getting easier, a new danger emerges from beyond the 99 caverns. Eli and the Shane Gang rush to the rescue, but nothing can prepare them for what they encounter: a slug that can do something no one in Slugterra has ever seen — or heard — a slug do before! Traditional slugslinging no longer applies — Eli will have to engage in a very different kind of duel to save Slugterra...and himself!

Determined to up his game against Stone Warriors, Kord visits a famous Eastern Technician for help creating a new blaster upgrade. Building the new upgrade is difficult…but working with the Technician is practically impossible!

Tad is missing after the slug-out with the Shadow Clan, so the Gang sets off without him to investigate reports of slugs disappearing. The mystery deepens as the trail of slugs leads straight to Dr. Blakk's old stronghold!

15-year-old Eli Shane is just a regular kid from the suburbs, except for one thing: he comes from a long line of Shanes, each of whom has made the journey from the surface to protect Slugterra and the slugs that make the underground world so special. Now its Eli's turn to be Slugterra's next Shane -- whether he's ready or not! Unfortunately, the slugslinging tournament he enters to prove that he's ready, quickly shows that he's not! So when word of this new Shane reaches the ears of the nefarious Dr. Blakk, he's not too worried... yet.

The gang has to trade one of Eli's prized his slugs for some new gear, but when Eli has second thoughts and goes back to get his slug, they learn its been sold to Dr. Blakk!

Eli and the Gang find a way to take Junjie back home to the Eastern Caverns and discover trouble waiting for them when they arrive.

As the Shane Gang returns to the 99 caverns from their Eastern adventure, they find Gateway Cavern overrun with slugs. In the Shane Gang's absence, the Shadow Clan took a different approach to protecting the caverns, putting slugs before the needs of people and it's up to Eli and the gang to restore balance.

Eli has added some awesome new slugs to his arsenal: the extremely powerful Elemental Slugs. But in order to control them, Eli must learn Slug Fu--the ancient form of slugslinging that Junjie mastered in the Eastern Caverns. Slug Fu is the art of guiding and controlling a slug in battle--a skill that only the greatest slugslingers can master.

When the Shane Gang travel to the Auroris Mine, they discover a legendary monster carved out of stone attacking the mines—the Pyritor. Trixie studies the legend to help them locate the creature’s home and put a stop to its reign of terror, but first they must confront the true nature of the beast, and its assistant!

When Eli and the gang enter the Deadweed cavern, they discover a huge amount of El Diablus Nacho, the Dark Water Dr Blakk uses to brainwash innocent slugs.

In a climactic battle, Junjie and Eli confront the Emperor and the Dai-Fu as the fate of the entire Eastern Caverns hangs in the balance!

While Junjie struggles with the knowledge of what he did during his time as the Dark Slinger, the Shane Gang meet a former servant of the Emperor who wants to turn over a new leaf. But can the Shane Gang help a bad guy learn to do good?

The Shane Gang takes Tad under their wing, training him to become a great slugslinger with Eli's old blaster. Their training is put to the test when the Gang brings Tad to answer a distress call that leads to a showdown with the Scrap Force and the Shadow Clan.