Æon Flux is set in a surreal German Expressionist-style futuristic universe. The setting comprises a bizarre dystopia populated by mutant creatures, clones, and robots, set within the separated border-wall cities of Monica and Bregna. The title character is a tall, sexy, scantily clad dominatrix secret agent from the city of Monica — skilled in espionage, assassination and acrobatics. Her mission is to infiltrate and destroy the strongholds of the city of Bregna , which is led by her sworn enemy, and sometimes lover, Trevor Goodchild — the technocratic dictator of Bregna, whose citizens are called Breens. The two cities engage in a futile, never-ending war for ideological supremacy. While Monica represents a dynamic nihilistic, anarchist society where rules do not exist, Bregna embodies a centralized, scientifically planned Orwellian police state. The names of their respective characters reflect this: Flux, as the self-directed agent from Monica, and Goodchild, as the self-appointed leader of Bregna. Themes of tragic/forbidden love run throughout the series as Trevor has everything but what he truly wants, Æon; and Æon can accomplish anything she wants except killing Trevor.