Important Notice: Before the events of Slugterra: Ghoul from Beyond and the discovery of The Eastern Caverns, the term "SlugTerra" was previously used as another way to describe The 99 Caverns, however since then the term has been given a much broader meaning and describes any land that consists of slugs..
SlugTerra is largely populated with Humans and Slugs, however it's also home to a number of other species, both humanoid and otherwise.
- Ice Ogres
- Lava Bats
- Dino Rats
- Crystal Worms
- Magma Monsters
- Cavern Crawlers
- Frost Worms
- Acid Shrimps
- Brain Leeches
- Eye Eaters
- Dino Beasts
In the underground world of SlugTerra there are many types of plants to be found.
- Mushrooms: Which are large than normal and can be found all over SlugTerra.
- Coral: A rough aquatic plant found at the bottom of the ocean floor of caverns like Undertow Cavern and is a great place for AquaBeeks to hide.
- Grasping Seaweed: A seaweed that rapes around things and found at the bottom of the ocean floor of caverns like Undertow Caverns.
- Vinedrill Blossoms: A flower that grows on Vinedrill vines and can be found mainly in Serenity Cavern.
- Peach Blossom Trees: Trees that sprout pinkish flowers called Peach Blossoms and are found in Peach Blossom Spring Cavern.
- Main article: Jobs
- Slugslinging: Technically not a job, but it's a skill with much to offer in other professions and opportunity for others as well.
- Security Slinging: Often disparagingly referred to as "mall cops", Security Slingers are a close-knit group who uphold justice in malls across SlugTerra and take their jobs very seriously.
- Slingersmithing / Blastersmithing: Design, build and repair blasters.
List of SlugTerras
- The 99 Caverns - These were the series' original setting(s) and the home of Pronto, Kord and Trixie, and are/were protected by Eli & his family
- The Eastern Caverns - These are the series' current setting(s) and are the home of Junjie and were/are protected by Junjie & his family
- The Deep Caverns - technically not apart of SlugTerra but still part of the underground, this is the home of the Darkbane.