The Shane Gang return home to the 99 caverns to find Gateway Cavern overrun with slugs-in Eli's absence, the Shadow Clan have governed by putting the slugs before the people, and the result is chaos! It's up to Eli to restore the balance, but the Shadow Clan aren't as friendly as they once were...and that's saying something. Help comes from an unexpected source-Tad and his slug Pieper, who just arrived from the Surface!