The Ultron Imperative

S1, E23: As the devastated team struggles with a loss, Ant-Man and Iron Man go about destroying all remnants of Ultron. But they don't realize that Ultron has transcended his body, and has infiltrated the world's computer systems. Because the only way to bring peace to Earth is to eliminate those who would cause chaos... and that's all of humanity. Ultron has begun the end of the world.