After an urgent trip to the Arctic, a scientist and his friend are quarantined with an illness that soon escalates into something sinister.

Michael continues to prowl for victims as Luther struggles with a traumatic loss and painful accusations; Kaylee makes a connection.

Luther pleads with the DNS to bring Michael in alive, but other pursuers have less peaceful intentions; Danika's urges grow stronger.

As Michael and his followers settle into new accommodations, a tough-talking general takes control of the DNS; Luther witnesses a brutal act.

Desmond's health worsens, forcing Luther down a dangerous path; Luther receives a surprising offer and Michael lays down the law.