Slugterra: Ashter's Road

When born in an underground world, Ashter Lake is one of many who are surprisingly orphaned in the series. But living off of nothing won't cut it. Finding out about his mother's talents in a sport called "Slug Slinging," the boy finds her blaster and sets off to make a name for himself.
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Once he finds someone to do so. But one particular boy would help him achieve that...
Enter, Ashter Lake's road to his greatest chapter of his life.