So the series finale aired last night
Spoiler:
It ends with a cliffhanger,
Basically in the last 15 minutes, Joe sacrifices himself to bring the dome down, any survivors were kidnapped by the military. Jim kills his son in a scuffle. Barbie kills his daughter (who grows up pretty quickly into an adult and is the new leader of the Aliens) Anyone infected was shipped off to some military base while anyone not showing signs of being infected (Like Barbie, Jim, Norrie, Julia, Hunter, etc.) were let go but were not allowed to talk about what actually happened inside the dome.
There's a bit of a time skip, Jim used the leverage of not being allowed to talk about the dome to become of US Senator, Barbie and Julia are on a road trip across the country, Norrie is seen trying to break into a military base, thinking Joe is alive with the rest of the infected prisoners. Hunter and The girl that was with the group become high level government employees.
Show ends with Barbie's daughter being alive and intending to put up a new dome