Chaos Rising (Relic Entertainment / THQ), the first DoWII expansion, continues the intricate storyline from that game and takes it to a deeper and darker level. As expected, CR adds new units and upgrades to each faction. The big addition here is called the Corruption System, which tracks how close your forces are to giving in to Chaos depending on the choices you make in certain in game events. Your choices also lead to you having one of the multiple endings play out at end game. Really, you’ll want to play through again and again to see all the endings.
Chaos Rising is available on Steam.