Humans are all dead and only zombies are alive who have now turned on each other for food. You're one of the zombie factions and must destroy others to survive now.
Those insolent orcs are getting in the way of our rightful claim to this land! Mine gold, chop down trees, construct buildings, train units, heal your armies, and chop up bad guys directly all by just hovering your mouse over those objects!
Think you saved humanity...? Not so fast! On the eve of your glorious campaign to retake the galaxy, a new threat emerges. Fight the Creeper in a new environment while you excavate and build your industry of war.
Man the forge and craft the best weapons for your warriors in Jacksmith! Collect better ores and parts to make better weapons, and keep making progress across the land towards the evil wizard Dudley!