Slugterra (2012)

S3E9 Slug Day

In the Eastern Caverns, a festive winter holiday celebrates the enigmatic “Giver,” who comes each year to bestow slugs upon the locals. However, chaos erupts when a band of thieves absconds with the Giver's treasured slugs. The gang springs into action to recover the stolen goods, embarking on an adventure that will unveil the true identity of the Giver.