At the hospital Kevin becomes an involuntary test subject on what is driving the mist. Meanwhile at the church, Nathalie Raven discusses her theories about the mist and has a violent encounter with one of the church parishioners.
Kevin's group finds an unlikely sanctuary in the psych ward. Tensions at the mall grow as food runs low. Nathalie and Father Romanov face off at the church.
Nathalie's influence over the remaining church parishioners continues to grow. At the mall Alex and Jay grow closer until Eve intervenes. Kevin and the group make a stop at Adrian's home where Kevin makes a shocking discovery.