Butch is a Thresher Slug who belongs to Sergent Slug. Although Butch is a regular Thresher slug it has yellow eyes which always stays yellow in its protoform because of the regular trainning sessions conducted by his slinger Sergent Slug using the turret-like machine.
- Protoform Abilities - Can chomp through most objects.
- Throttlebit - Curls into a flat circle and spins like a saw blade, boney spines on the outside to slice things.
- Club Slug (First appearance)