Dawn of the Slug Slugterra : Season 1 Episode 13

After doing days, maybe weeks, of enforcing the peace in Slugterra the gang head to the mall cavern to relax, play games and get a new bag for Pronto. Just as they arrive, they find the cavern empty and hear weird noises, which turns out to be a classic horror movie sound when they discover that the mall is crawling with zombies!