The BEST episodes written by Craig Engler

#3 - Going Nuclear
Z Nation - Season 1 - Episode 10
The survivors square off against radioactive zombies when they arrive in a South Dakota town that's on the brink of nuclear disaster.

#4 - Sisters of Mercy
Z Nation - Season 1 - Episode 11
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.