Armed with his powerful new weapon the Gatling Blaster, Blakk's unstoppable battle train threatens to run roughshod over all of Slugterra - unless Eli can master his new Double Barrel Blaster and come up with a powerful fusion move in time to stop it.

The Shane Gang find themselves competing in the Slugball Championship - a rough and tumble cross between hockey, slugslinging and rugby - with deadly random obstacles thrown in for fun! Eli suspects the rival team is cheating, but he's going to have to prove it first... that is if he can survive the game!

Locke and Lode have run roughshod over a cavern and The Shane Gang aim to kick them out. But the townspeople have their own hero to clean up the town - none other than the King of Sling, a pompous Slugslinger the gang has bested on a number of occasions. There is no way he'll survive against two of Blakk's minions, but Eli can't intervene without humiliating the king! So the Shane Gang decide to work behind the scenes to make the king victorious. That is until Dr. Blakk himself arrives...

The Shane Gang follow Diablos Nacho to Molemound - the Molenoid home cavern. Pronto doesn't want to go - and not because he's in trouble. It turns out Pronto is the rightful KING of the Molenoids. He's been ducking the crown for years since the king's main responsibility is settling arguments and fixing leaky plumbing. But Pronto must play king for a day while the Shane Gang follows Nacho into the great Molenoid library to stop him from taking a valuable map. Meanwhile, Pronto faces an unwelcome challenge for the throne by his Life! Long! Nemesis! Seedo.

Our heroes are lured into an elaborate game by a twisted villain calling himself the Game Master. The Shane Gang must use every bit of skill they have to pass each level, but there is a devious twist: every slug they fire is captured, with the promise that they'll see them again only if they manage to make it to the end. That's becoming all the more difficult with fewer and fewer slugs...

A mysterious creature is draining the energy from all the slugs in a distant cavern, and the residents are offering a rich reward to whoever can stop it. Mercenaries come out of the woodwork hoping for the prize, but the Shane Gang aim to stop it for free. That's what they do. It turns out this creature is more dangerous than anyone could imagine, and one by one, the hunters are taken out of the game - leaving only Eli and the reviled STOCKER remaining. The two forge an uneasy alliance, but can a mercenary like Stocker really be trusted?

Dr. Blakk has been captured! Now it's up to the Shane Gang to transport him to Stalagmite 17, the only prison that can hold him. To do so, they're going to need some serious speed. That's just what they get when we reveal Kord's new modifications to their Mecha Beasts! But will it be enough to stand up to Blakk's own newly-designed super vehicles?

While the rest of the Shane Gang defend the perimeter from the legions of Blakk Guards sent to free Dr. Blakk from prison, Eli interrogates the captured villain. Surprisingly, Blakk feels like talking. He reveals where he came from, how and why he discovered ghouls and most importantly of all, Eli learns the truth about what happened to his father.

Dr. Blakk and his Darkbane minions have discovered a way to make their ghouls faster and stronger - giving them an edge over the Shane Gang. In order to even the odds, Eli is going to need his most powerful slugs and an upgraded blaster from Redhook. The only problem is, Dr. Blakk already has the slingersmith working for him... Eli and the gang attempt a daring rescue mission to free Redhook, but along the way discover Blakk has a much more sinister plan in the works.

Dr. Blakk has succeeded in creating a gap in the magical slug-energy barrier that protects Slugterra, opening the way for the evil Darkbane to tunnel their way up from the Dark Caverns. Eli and the Shane gang must stop this at any cost. Now armed with a selection of upgraded slugs, blasters and armor, they take the battle to Dr. Blakk's front door. While his team slugs it out against Dr. Blakk's minions, Eli takes on Blakk himself once and for all!