Slugterra | Upgrade & Back to Blakk

Upgrade:
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?
Back to Blakk:
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.
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Eli Shane is determined to be the greatest Slugslinging hero of them all! Only by collecting, training and dueling with little critters called SLUGS can Eli and his team hope to defeat the forces of evil. Did we mention the part where the slugs transform into powerful magical beasts? Slugterra is an epic sci-fi comedy adventure set deep underground, where the ammo's alive and only the quick survive! In this luminous, high-tech, underground world every cavern holds a new adventure, new battle and weird little slugs to be discovered! The story follows Eli and his crew as they explore the caverns, challenge rivals and each other to friendly duels, upgrade their cool gear, and generally have a blast in this never-before-imagined underground world! But there is a very real threat to the world and the slugs; Dr. Blakk is seeking to ""ghoul"" the slugs, transforming them into feral mindless weapons! No one has been able to stand up to Blakk's powerful slugs and army of henchmen... until now.