Ngl I feel like one thing that would have been really fun to see in Slugterra post-Blakk downfall would be the slingers he hired working with each other or characters outside of Blakk Industries.
like for example: after some hijinx ensue maybe Twist accidentally gets dragged into joining the Scrap Force or Sedo and Saturday team up to try (and fail) to get revenge on Pronto.