Eli Shane wins his battles and gets a new slug. It's time for the finals, but Eli is beaten with a dark slug given to his opponent by Dr Thaddius Blakk.

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!

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.

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.

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.

When even Kord can't find a way to fix what's wrong with the new upgrades to the Shane Gang's Mecha Beasts, it's time to go to the source: the wondrous Mecha Forge! Hoping to find the cause of the glitch, the gang instead uncovers a huge conspiracy--hatched by Dr. Blakk!

Eli doesn't believe in ghosts -- until he enters Deadweed cavern! But it turns out Eli's first instinct was right. What lurks inside Deadweed is far more evil than ghosts, its El Diablus Nacho, after a supply of the dangerous Dark Water that Dr. Blakk uses to turn innocent slugs into Ghouls.

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.

Pronto is thrown in jail on trumped-up charges by a corrupt judge, and the only chance to break him out is Eli making a one-in-a-million trick shot. Only one slinger in all of Slugterra can help Eli make a shot like that—Mario Bravado. Finding the formerly-great-but-now-washed-up Mario is easy. Getting him to help is something else entirely.