During his greeting speech, Lex made a reference to how Zeus cruelly punished the Titan Prometheus for enlightening humankind, much to the visible dismay of Diana. Shortly thereafter, she covertly stole a hacking device of Bruce Wayne's, who is likewise investigating Lex Luthor. She exited the party with Bruce pursuing her, but manages to make it to her car and drive off just in time for Bruce to see her depart.
Diana sees Sir Patrick Morgan in the base, who reveals himself to be the true Ares, and tells her of his plan for a world without humanity by having them destroy each other. Ares proposes that Diana help him accomplish his vision of paradise, but Diana promptly refuses, not wanting to kill billions of innocents. Ares then reluctantly engages her in an epic battle while Steve and his comrades attempt to dismantle the plane harboring the mustard gas.