Reeling from the events of their standoff with Moloch, Ichabod and Abbie encounter an angel, Orion, that they believe can help them. Meanwhile, Katrina searches for the humanity in Abraham.

The Chester’s Mill residents receive an unexpected visit from their loved ones on the other side. Meanwhile, the community braces for a threat from outside the Dome.

The residents of Chester’s Mill find themselves trapped under an enormous, transparent dome. Panic escalates as resources dwindle rapidly.