Not much is known about Welder Walter except for the fact that he's best known for being 1 of the 2 minor characters of the Scrap Force and has been seen in various locations doing a varity of jobs.
Before he debuted as one of the members of the Scrap Force, he can be seen working as 1 of Dr. Blakk's Beast Forge employees, but he now appearances to have left his thugs ways behind, including leaving "The Tough Guys", to pursuit a normal life and has since been seen doing various jobs until Slugterra: Eastern Caverns where he seems to have found his calling as a miner in Gateway Cavern.
- The World Beneath Our Feet Part 1 (First appearance)
- The World Beneath Our Feet Part 2
- The Slug Run
- Mecha Mutiny
- The Hard Part
- Slugterra: Ghoul from Beyond
- Slugterra: Return of the Elementals
- Slugterra: Slug Fu Showdown
- Slugterra: Eastern Caverns
- He makes his first speaking appearance in Slugterra: Eastern Caverns.