A mercenary opened a thread showing the possiblities of future planets (maps) that could be introduced to Dust. One of those links were to the hostile planet (fanfest concept '11).

It got me thinking about a zombie game mode since it looks mysterious and foggy.

So what if mercenaries are contracted to investigate an alien signal at that mysterious planet. They are sent down to gather data. Cut to game mode, it would be set up like an ambush match, instead it would have 100 clones. Once the clones get down to 50. The game switches to a zombie mode style. Let say by the time it gets to 50 clones, all the fighting on the surface has awakened the planet's natural defenses. A toxin is released into the air. One merc is infected. Now all the mercs that were fighting an ambush styled match now has to band together to fight against this one merc who is looking to infect others. Have friendly fire on the entire match, which increases the intensity of the second half of battle.