Slug

A Slug is a species existing only in Slugterra. To catch one, you can either trade for them, buy them, raise them from babies, obtain them as a reward in a competition or catch them in the wild. The caverns in Slugterra rely on their slugs to keep them from turning into a dead zone. Exposing Slugs to Dark Water turns them into Ghoul Slugs.

Normal

 * 1) AquaBeek
 * 2) Arachnet
 * 3) Armashelt
 * 4) Boon Doc
 * 5) Bubbaleone
 * 6) Crystalyd
 * 7) Dustpuff
 * 8) Enigmo
 * 9) Fandango
 * 10) Fingerling
 * 11) Flaringo
 * 12) Flatulorinkus
 * 13) Flopper
 * 14) Forgesmelter
 * 15) Frightgeist
 * 16) Frostcrawler
 * 17) Geoshard
 * 18) Grenuker
 * 19) Hop Rock
 * 20) Hoverbug
 * 21) Hypnogriff
 * 22) Infurnus
 * 23) Inkdevil
 * 24) Jellyish
 * 25) Lariat
 * 26) Lavalynx
 * 27) Mimkey
 * 28) Needlow
 * 29) Neotox
 * 30) Phosporo
 * 31) Polero
 * 32) Raast
 * 33) Rammerstone
 * 34) Sharkus
 * 35) Slyren
 * 36) Smimk
 * 37) Sonikin
 * 38) Speedstinger
 * 39) Tazerling
 * 40) Thresher
 * 41) Thuglett
 * 42) Tormato
 * 43) Toxis
 * 44) Universal Slug
 * 45) Vinedrill
 * 46) Xmitter
 * 47) Ancient Slug

Artificial

 * 1) Roboslug

Ghouls

 * 1) Amperling-ghouled Tazerling
 * 2) Blimplown-ghouled Bubbaleone
 * 3) Blinddevil-ghouled Inkdevil
 * 4) Boomer-ghouled Grenuker
 * 5) Boon Death-ghouled Boon Doc
 * 6) Cryptogriff-ghouled Hypnogriff
 * 7) Darkfurnace-ghouled Infurnus
 * 8) Flatlorex-ghouled Flatulorkinus
 * 9) Hop Jack-ghouled Hop Rock
 * 10) Illusiolett-ghouled Thuglett
 * 11) Jollyfist-ghouled Jellyish
 * 12) Needlowveil-ghouled Needlow
 * 13) Neurotox-ghouled Neotox
 * 14) Nightgeist-ghouled Frightgeist
 * 15) Pyringo-ghouled Flaringo
 * 16) Tempesto-ghouled Tormato
 * 17) Thrasher-ghouled Thresher
 * 18) Blachnet-ghouled Arachnet

Elements

 * Fire - Hop Rock, Grenuker, Infurnus, Flaringo, Forgesmelter
 * Water - Lariat, Jellyish, Bubbaleone, AquaBeek, Sharkus
 * Earth - Rammerstone, Arachnet, Crystayd, Lavalynx, Dustpuff, Needlow, Geoshard
 * Metal - Speedstinger, Armashelt, Thresher, Polero, Roboslug
 * Plant - Vinedrill
 * Toxic - Flatulorinkus, Toxis, Smink, Neotox, Inkdevil
 * Electric - Tazerling, Xmitter
 * Light - Fandango, Phosporo, Boon Doc, Enigmo
 * Ice - Frostcrawler
 * Psychic - Frightgeist, Hypnogriff, Thuglett, Raast, Mimkey
 * Air - Tormato, Hoverbug
 * Sound - Sonikin, Slyren
 * Other - Flopper