This server is SFW and 18+
There's been an outbreak of a new disease which caused zombies all across the United States. Of course, South Park was infected too. Now the dead has arisen.
Most adults are dead. The kids have been split up, but some have managed to find others. They're also aged up 5 years for the sake of the story.
The groups are:
Wendy, Kyle, Ike and Cartman
Kenny, Butters, Karen, and Craig
Tweek, Bebe, Clyde and Jimmy
Anyone not listed is alone. One kid from each group has a walkie talkie, and each loner kid has their own walkie talkies.