The survivors search for a « natural » cure for the virus at a greenhouse that’s being guarded by zombie-plant hybrids.

A pregnant Serena tracks down Murphy. The survivors stumble across a hidden Mennonite farm with new dangers.

Everyone tries to escape the impending nuclear blast; Citizen Z battles thawed zombies and issues an air bounty for Murphy.

The two groups of survivors reunite in Utah, where they come upon an all-female commune that seems like paradise—that is, until someone ends up dead.