A Thrasher is the Ghouled version of the Thresher. They are blackish-blue, with blue markings, razor teeth, and a bladed back. Their transformation leaves them similar to a Thresher's 100mph form, but respectively coloured and with sharper teeth and serrated blades.
- Protoform Abilities - Can cut or chomp through small things, will bite.
- Knawtooth - Chomping "beartrap" teeth, like a piranha.
- Ammochump - Targets and slices through an opponent's ammo belt or pouch, making it hard to choose, retrive and load Slugs.
- Knawblade - Deploys boney spines from back and curls into a metal ninja star/sawblade.
- Bonevault - Catches Slug in midair and wraps around it creating a boney, spikey prison - hard to open.
- The Trade (First appearance)
- The Journey Home
- King of Sling
- Bandoleer of Brothers
- Slugterra: Ghoul from Beyond
- Slugterra: Return of the Elementals
- Slugterra: Eastern Caverns
- Slugterra: Into the Shadows