Its the Zombie Apocalypse and this takes place when they're 13 to 16

Alisa's group

Alisa Thornson, uses her ice gun and a axe, the leader

Sam Thornson, uses a pistol, little brother of Alisa

Kaylie Broflovski, she uses any kind of gun, her favorite is a Sniper, is the medic, got separated from Kyle and Ike

Lexi Solar, uses a AK-47, a scavenger for supplies

Andy Tucker, uses a katana, another scavenger for supplies, got separated from Craig and Tricia

You can create you're own group or join any of the others

Stan's group

Kyle Broflovski, Ike Broflovski, Stan Marsh, Eric Cartman, Kenny McCormick, and Karen McCormick

Craig and those guys

Craig Tucker, Tricia Tucker, Tweek Tweak, Clyde Donovan, Token Black, and Jimmy Valmer

The Girls

Wendy Testaburger, Bebe Stevens, Nichole Daniels, Red McArthur, and Heidi Turner

The Goths

Firkle Smith, Henrietta Biggle, Pete Thelman and Michael

The Others

Shelly Marsh, Kevin McCormick, Scott Malkinson, Kevin Stoley, Timmy Burch, Mike Makowski