Aeon Flux was the second game I worked on at Terminal Reality. It was a very short schedule (9 months) for a movie tie-in.
Mostly, this coincided with my development of a new Particle Engine and Editor for the Infernal Engine. I called it Ephemera after one of my favorite characters on the previous game I worked on: Bloodrayne 2.
This was my first real experience building not just a feature or a system, but a complete tool for artists to use.