Zombies are pretty popular right now. Perhaps there's some kind of reason on a deep psychological level that zombies hit a primal soft spot, that as a twisted reflection of ourselves there's a more powerful horror than regular monsters could ever achieve. Or it could just be that zombie AI patterns are relatively easy to program and they're good for no-frills kills.
Which brings us to Tactical Soldier: Undead Rising - a fairly straightforward strategy RPG dealing with a zombie invasion in a way that only B-grade entertainment can deal with. It's no Disgaea, it's no Final Fantasy Tactics, but it's a rollicking good time nonetheless.