The group finds a safe haven in the form of a functional military base run by Weaver's old flame. Meanwhile, plans spin into motion for a final assault on the Espheni, yet it dawns on the 2nd Mass that things aren't exactly as they seem.
An injured Tom takes refuge with a family and learns about life without war in the process. Meanwhile, Hal and Isabella's relationship blooms as they search for Tom; the 2nd Mass locates an Espheni device; and Maggie makes a decision, with consequences.
The 2nd Mass members leave Chinatown and head to what they anticipate will be the final Espheni battle. On their journey, they happen upon an unhinged gunman, who takes Weaver hostage. Meanwhile, Tom tries to rescue Hal.
Still reeling from Sara's death Pope vows vengeance against the man he holds responsible: Tom Mason, he gathers others to his cause including Anthony and they present themselves as a new threat to The 2nd Mass. Elsewhere Cochise attempts to leave in order to prepare for the end of his lifespan but Anne intervenes and proposes a solution that would extend Cochise's life and allow him to remain with The 2nd Mass.moreless
The 2nd Mass makes a discovery about the source for a seemingly endless supply of enemy forces. Elsewhere, Tom's leadership spreads to remaining human militias; Hal helps Maggie on a personal mission; and Tom must make an agonizing choice.
An unexpected skitter attack leaves the 2nd Mass without food, triggering a desperate mission to find supplies. Meanwhile, Maggie makes false promises to protect the 2nd Mass, and it's discovered the Espheni have created hybrid being that's part Espheni, part skitter, part hornet and part human.
Tom's life is in peril as his beamer drifts into space following a successful yet tragic mission to destroy the Espheni power core. Also: Anne reluctantly takes on a leadership role; and a new plan for winning the war is shared. The Season 5 opener.
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