The short answer is: of the original Slugterra series.
Here is how the math works out depending on what you consider an "episode."
Slugterra consists of 52 episodes, spread across 2 seasons. The show's engaging storyline, lovable characters, and exciting slug battles made it a hit among fans. This comprehensive guide provides a detailed episode list and series overview, making it a valuable resource for both new and old fans of the show.