Dark Urchin is the Ghouled version of the Dirt Urchin. The Ghoul debut in the episode "The Trade" as one of the ghouls when Dr. Blakk offered it to SlugSlingers for them to work for him. It was also used by El Diablos Nacho in the same episode.
- Protoform Abilities - Spiky and unpleasant to hold.
- Sandspur - Shoots razor sharp spikes like a porcupine.
- Weedzillo - Rolls along the ground like a tumble weed shooting off tons 'o scythes.
- Krictus - Explodes in midair, firing multiple rounds of spinning razor-sharp spikes.
- Thorngarten - Forms a wall of cactus-like thorny plants - easy to knock down, but painful.
- The Trade (First appearance)
- Keys to the Kingdom
- Dark as Night
- Light as Day
- Slugterra: Ghoul from Beyond
- Slugterra: Return of the Elementals
- The Emperor Strikes Back
- Slugterra: Into the Shadows