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Season 4, Episode 1, "Ghost in the Machine" - The Masons and the 2nd Mass order come under a brutal attack from a Espheni war machine. The Masons soon realize they need to build new relationships and work on their survival techniques.
Season 4, Episode 2, "The Eye" - Tom finds out what the Espheni plan is and is faced with making an impossible decision. Weaver and Pope try and escape from the Espheni prison. Matt tries to hide who he's working for and against. Anne looks for her daughter.
Season 4, Episode 3 - "Exodus"
The 2nd Mass orchestrates a complex scheme to escape from the Espheni Ghetto. Meanwhile, Maggie confronts Lexi in Chinatown; Matt tries to dissuade Mira from taking part in a risky escape plan; Anne has a flashback about her time in the Espheni Tower.
Season 4, Episode 3, "Exodus" - Tom and the 2nd Mass try to come up with an escape plan.
Season 4, Episode 4, "Evolve or Die" - Tom and 2nd Mass look for refuge. Tom leads Weaver and Cochise to find Matt.
Season 4, Episode 5, "Mind Wars" - Tom runs into some strangers in the woods. Hal tries to lead the remaining survivors from Volm and 2nd Mass.
Season 4, Episode 6, "Door Number Three" - Tom gets back together with his family and the 2nd Mass. Lexi has a health crisis.