Dead Nation occurs in an apocalyptic world overrun by a zombie virus. (housemarque.com)
Now I know what you're thinking... «How in the hell could Dead Nation, a game about our world being completely overrun by the zombie apocalypse, be suitable for Valentine's Day?» (shortpause.com)
The only thing that stands in your way: city after city overrun by zombies. (andyemulator.com)