Season 1
The adventure follows Eli and his team of friends as they explore the caverns, challenge rivals and each other to duels, upgrade their cool gear, and generally have a blast in this never‐before imagined underground world. But there is a very real threat to Slugterra; Dr. Blakk is seeking to “ghoul” the slugs, transforming them into feral mindless weapons! No one has been able to stand up to Blakk’s powerful ghouls and army of henchmen…until now!
Episodes
1 The World Beneath Our Feet (1) Oct 15, 2012 
2 The World Beneath Our Feet (2) Oct 17, 2012 
3 The Trade Sep 16, 2012 
4 The Slugout Sep 23, 2012 
5 Club Slug Oct 20, 2012 
6 The Slug Run Oct 23, 2012 
7 Mecha Mutiny Oct 24, 2012 
8 Deadweed Oct 25, 2012 
9 Shadows and Light Oct 26, 2012 
10 Mario Bravado Oct 27, 2012 
11 Endangered Species Oct 29, 2012 
12 Undertow Oct 30, 2012 
13 Dawn of the Slug Nov 1, 2012 
14 The New Kid (1) Feb 12, 2013 
15 The New Kid (2) Feb 13, 2013 
16 Snowdance Feb 14, 2013 
17 Inheritance Feb 15, 2013 
18 A Distant Shore Feb 16, 2013 
19 The Journey Home Feb 20, 2013 
20 Roboslugs Feb 21, 2013 
21 The Unbeatable Master Feb 22, 2013 
22 Dark Water, Deep Water Feb 23, 2013 
23 The Gentleman and the Thief Mar 26, 2013 
24 No Exit Mar 27, 2013 
25 The Hard Part Mar 28, 2013 
26 What Lies Beneath Jul 2, 2013 
27 The Return Jul 3, 2013 
28 Slugball Jul 4, 2013 
29 King of Sling Jul 6, 2013 
30 Mission: Improbable Aug 18, 2013 
31 Keys to the Kingdom Aug 25, 2013 
32 The Thrill of the Game Sep 1, 2013 
33 Lightwell Sep 8, 2013 
34 It Comes by Night Sep 15, 2013 
35 Upgrade Sep 22, 2013 
36 Back to Blakk Sep 29, 2013 
37 Bandoleer of Brothers Oct 6, 2013 
38 Dark as Night Oct 13, 2013 
39 Light as Day Oct 20, 2013