The citizens of Defiance prepare to cast their votes for mayor; Nolan’s past violently rears its head; Irisa must decide whether or not to embrace her destiny.

Amanda’s mayoral campaign is threatened when Nolan is involved in an accident on the eve of the election, prompting the town to question Amanda’s decision to appoint him as Lawkeeper.

The town of Defiance is shocked when the remains of a leading businessman who went missing almost six years ago, are discovered hidden in the walls of the NeedWant.

Following the big storm, Nolan and Tommy find an American astronaut who has been in an induced sleep for the past several decades.

A deadly plague threatens the town; racial tensions rise when the Irathients, who are immune to the virus, are quarantined.

An old war buddy catches up with Nolan at the same time a Castithan criminal with a history of violence enters the picture.

Kenya is kidnapped. Rafe learns that Luke was involved in some mysterious goings-on at the mines and orders Quentin to get to the bottom of it.

Rafe & Nolan search underground St. Louis while looking for an escaped convict. Meanwhile, a violent Castithan tradition causes clashes amongst the residents of Defiance.

Nolan and Irisa arrive in Defiance, where the town is soon divided over the death of Luke McCawley. But a bigger threat forces everyone together: An attack by the Volge.