For the most reliable , use the Slugterra Wiki on Fandom (episode list format) or check IMDb’s episode guide for accurate air dates. If you want a printable or PDF guide , fan-made ones on Reddit or DeviantArt can be good — but verify episode order against official sources.
In episode 3, "The Air Slug," they meet a swift and agile air slug named Zephyr. However, they soon realize that Zephyr is being pursued by a group of ruthless slug riders, forcing them to go into hiding. slugterra episode guide