Arby 'n' the Chief

Apocalypse (8x17)

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Adam's hired programmer Cody completes for him Hate Machine, a cyberweapon of mass destruction in the form of a program that steals data, lethally destroys power supply units and duplicates and re-executes itself using bots as hosts to spread exponentially, resulting in the deaths of up to hundreds of thousands of people. Arbiter and Chief make a last-ditch effort to stop him, paying a price they're not prepared to, and make discoveries there's no turning back from.