Sparky is a Grenuke Slug who belongs to Eli Shane. Sparky first appeared in "The Slugout", where he was used to theaten Billy into leaving Quiet Lawn Cavern. He was seen again in "Inheritance", where he was inside Eli's blaster, being pointed at Dana Por. In "What Lies Beneath" Sparky was fired for the only time in order to cover Kord.
- Protoform abilities: Shoots sparks.
- Mushboom: Timed explosion, powerful targeted blast with a mushroom cloud.
- The Slugout (First appearance)
- What Lies Beneath
- Dark as Night
- Light as Day
- Slugterra: Ghoul from Beyond
- The Lady and the Sword
- In the Battle For Slugterra online game, it is misnamed. (Instead of Sparky, it says Banger).
- It is seen as a Megamorph in The Lady and the Sword.