This series is truly one of the most underrated and best I've seen. The first three seasons at least are magnificent, they give you that feeling of adventure that even other series today would dream of, a lot of variety of characters and super interesting situations. Eli Shane for example is basically the Nathan Drake of Slugterra, very nice and fun to listen to even in the most tense situations, but who knows how to take things seriously, and has a great soul of an explorer. All the characters are pretty good, even the villains (except some fillers). What if they should have improved is to remove certain repetitive combat scenes and have added more slugs and gadgets, since sometimes this series becomes very monotonous (and therefore I do not recommend it to everyone), and this unfortunately becomes a negative point. A really negative point starting with the fourth season, where it seems that the creators did not have much more desire to make new episodes. The series could have perfectly ended with the third. From the fourth, all that essence of exploration and knowing what is beyond is lost, and they begin to introduce old characters like if it was fan service as if nothing had happened (especially in the fourth, personally the worst season by far) . Well, to be honest, it is something that was partly lost in the second and third seasons but at a lower level, in fact, the first two chapters of the first season seemed by far the best, since they introduce the concepts key to the series in a spectacular way, a better introduction even than Pokemon, its greatest inspiration.
In spite of that, Slugterra ended well within everything, and I can say that although the last three seasons were a disappointment, it was still worth watching this series, although it ended in a very forced and open way. Will there be more seasons? Only time will tell...
