The four members of the Shane Gang think they've found the fifth in Twist, a street-smart kid who volunteers his help when the gang needs it most on a mission gone wrong. But Twist harbors a dark secret that could doom the mission - and the Shane Gang.
Avalanched inside a frozen cavern, the Shane Gang can't figure out which is worse: being trapped with a vicious Ice Ogre that only gets bigger the more you shoot it? Or needing to work with The Hooligang to get out?
A thief breaks into the Shane Gang HQ looking for the fabled "Shane Treasure" - a portion of which she believes belongs to her. The thief escapes with nothing, but Eli does manage to find a treasure chest. To unlock it, the thief and the gang will need to travel to a remote, dangerous cavern to find a special slug. The journey is fraught with peril, and when they finally open the box, what's inside is not at all what they were expecting...
Notorious con man Gar Rivelle has many convinced he has discovered the way to a secret land... a land that seems to be the surface! Eli uncovers the truth - Gar is getting his information from a coded Shane diary. Keeping the surface secret is Eli's number one mission, so he steals the diary from Gar, sparking an all out siege on the Shane HQ. Eli's friends rally to the defense and turn the invaders away. Eli realizes that for him to continue in Slugterra, he's going to have to confide his greatest secret to his friends.
Eli fires slugs right and left during a fast-paced slugout on mecha-back! "See you back home," Eli tells the slugs he has to leave behind as he races across a cavern during the fight. The battle won, the Shane Gang is on its way back home when Eli runs into a situation that he can't ignore. One thing leads to another and Eli ends up challenged to a duel. Only one problem, Eli's doesn't have Burpy or the rest of his best slugs! They're still on the way back home!
Driven by his intense slug phobia, scientist Quentin Kozinski has invented mechanical slugs. Armed with this fearsome arsenal, he sets out to prove that science can beat any slug - and any slinger - including the Shane Gang! But Eli is determined to prove that no thinking, living thing can ever be bested by a machine.
A mysterious slugslinging master appears for the first time in 20 years. Though old, this slinger is an amazing battler - incredibly fast and the master of an unstoppable slinging technique. Eli, Korg, Trixie and Pronto all want to study with the master and learn this awesome move. But so does Dr. Blakk's protégé Twist! Now Eli must face off against Twist and prevent the master from choosing a villain for a student.
Blakk has hired Brutale - a thug as brutal as his name - to build a Deep Water Rig to drill for Dark Water at the bottom of the Cavern Sea. Needing some water-breathing labor for the job, Brutale steals Marvolio Drake's reptilian pirate crew. Desperate to get his men back, Drake forms an unlikely alliance with the Shane Gang, who are just as desperate to shut the Dark Water rig down.
Using some stolen Shadow Clan tech, Dana Por is able slip in and out of any cavern in Slugterra - and rob them blind! But when she makes the mistake of stealing from Dr. Blakk, Eli is the only one who can protect her from The Gentleman, a suave but deadly mercenary Blakk hires to take back what was stolen from him - and bring back the scalp of the girl who stole it!
Lumino cavern is under attack! A swarm of Neurotox ghoul slugs have created a massive toxic cloud that's attacking the residents. The Shane Gang must brave an inescapable maze called the Cavern of Time to locate Blite, the only man who knows enough about regular Neotox slugs to help them stop the cloud created by the ghouls. Just a few problems with that plan: Blite is a deadly maniac, whose reign of terror ended only after Will Shane trapped him in the Cavern of Time. All these years, Blite has been dreaming of getting revenge on the Shane. So Eli better be ready!
Eli and Kord have been trying to create a fusion shot: two slugs shot at exactly the same time that can merge their powers! But they'll need to mod Eli's blaster to handle it. In search of the one missing part that will complete Eli's Double Barreled Blaster, the gang journey to the Scrap Heap, a junk yard cavern of epic proportions. Finding the part isn't easy. Getting out with it alive past Boss Ember and his Scrap Force is nearly impossible.
When Eli and the Shane Gang find themselves trapped in the Deep Caverns underneath Slugterra they discover a whole new type of danger threatening to escape. Allowing it past the barrier would mean unprecedented peril - not only for Slugterra, but our world above too!