Dawn of the Slug is the thirteenth episode of Slugterra.
A fun trip to the mall cavern turns un-deadly when the place is over run by the zombie-like victims of the Zombus slug. With Pronto zombified (not entirely a bad thing, the others kind of like this new, quieter, more monosyllabic Pronto), the rest of the Shane Gang must find the mysterious Mr. Saturday who controls the Zombus slugs -- and find a way to stop him.
The gang is very tired from enforcing order in SlugTerra, so they head for a mall to relax, play games, and buy a new bag for Pronto. When they arrive, they are chased by zombies. They are aided by the mall's Security Slinger and try to find the cause for zombies in the mall. Pronto is taken to Mr. Saturday by the zombies. He is also turned into a zombie by Mr. Saturday who uses a Cryptogrif (Ghouled Hypnogrif). The gang defeats him and the Cryptogriff is cured by Doc. All the zombies, including Pronto, return to their original state. Mr. Saturday is sent to mall jail.
- There is a zombie without pale skin.
- In one scene Mr. Saturday is using a Grimmstone.