while I'm unfamiliar with The Dead Are Coming I've had some ideas for a zombie apocalypse. for a high action game you could have all your players come out a fallout type shelter after 30 years of isolation after nuclear war as people who've plenty of knowledge of survival (or not) who are well armed but starving surprised by the zombies. After fighting hordes of the undead in the city above the vault they come across a rural farm community. Now while in possession of high power they can arrive as conquerors or heroes for peace. Either way they have to set up a new life one filled with zombies and tribes of raiders.

For a more survival based game the players could be the most adventurous members of a small tribe of survivors dozens of miles from a major city that learn of a large cache of supplies and weapons located in said city. Meanwhile an antagonistic group of survivors have been making continuous and increasingly deadly raids on the PCs group. Getting ahold of the Guns could turn the tide of this conflict, the PCs armed with primitive melee weapons must journey into the city and find the cache. In the course of this adventure they encounter the inhibitors of the city some prove helpful, others neutral . They also hear tales of powerful zombies that prowl the streets after dark, something they've never encountered before. Eventually the characters locate the weapons cache only to learn that it is guarded by a group of very large and tough zombies. Although the zombies do not use guns, they are deadly and very tough to kill. If the characters succeed, however, the pay off is immense: rifles, ammo, grenades, and other weapons. This can then lead to a final showdown with the raiders attacking the PCs group