People are found on the beach, some living some not, with dozens more floating in the water. They claim to be from a hellish future where mutant humans have taken over and are exterminating the rest of us.

In a flash-forward, Reece adopts an orphaned Leah, going against the Apex. In present day, Jude works towards a peaceful solution with the government, but is surprised by a special forces team intent on capturing Reece at any cost.

Reece takes drastic measures to save Leah before it's too late. Hannah decides to escape the zone and visit the outside world.

Desperate to rescue his son from a potentially lethal situation, Jude makes a request that could endanger the lives of everyone at the camp; Hannah's secret past comes to light; Sophie discovers something unexpected in Leah's blood work.

Flashbacks reveal a haunting connection between Marshall and the early migration. Meanwhile, Jude investigates a mysterious disappearance, and Sophie risks her life and career to help Reece save her daughter.

A grisly discovery is made in camp. Jude makes a risky move to try to expose the truth. Reece is held captive.

Jude and Nestor find a connection to the crossing in an unlikely place that provides answers about what really happened. Naomi's growing influence leads to confrontation.

Jude and Nestor plan to break the refugees out of the camp, but the plan is complicated when Sophie arrives with new information. Marshall takes matters into own hands.

In the season finale, the refugees' lives hang in the balance as Jude and Nestor make an unlikely ally. Eve and Lindauer try to tie up loose ends.