In the beginning seasons, Aeon Flux was simply a collection of animated shorts which generally featured a scantily clad female assasin named Aeon. You don't actually find that out (until later seasons), because the shorts are almost all completely without dialogue. And, as mentioned above, Aeon always dies somewhere in the short.

One of my favorites was one which didn't focus on Aeon the entire time, but instead was about two warring factions, one of which Aeon was a member. The story continually focused on one hero who would infiltrate the enemy base, killing hundreds of enemy soldiers effortlessly, and then just before reaching his goal, he'd be killed by some enemy soldier he didn't see. Then the story would focus around that soldier, who would become the new hero, infiltrate the enemy base, kill tons of dudes, and then get killed. It switched back and forth like that several times, and was one of the coolest cartoons I've ever seen.