I got a campaign called zombie apocalypse at another threat
play@yog-sothoth.com going a couple of years ago. It is still in play. At the micro-level it is a zombie apocalpyse game, but at a macro its a cthulhu/mythos story- with giant worms burrowing beneath the world, and alien invaders who arrive via metoerites (actually eggs carrying giant mosquito like monsters that help spread the zombie apocalypse). Fun stuff if you are interested.
We used mostly slow walkers, but a few runners and zombie animals too.