The Venjix computer network is laying ruin to the entire planet, and the human race has retreated into the environmentally shielded city of Corinth.

As Venjix grows stronger, it becomes clear that the Rangers need more than three operators to defend the city.

Dillon goes through a series of tests to see if he even is Ranger material, but the real test comes when he is faced with the choice of seeking out his past or helping the Rangers as promised.

Ziggy's recruitment as Ranger Green is put into question when parts of his shady past are revealed. Should the Rangers work with someone who is hated by all seven of Corinth's cartels?