Zombies Versus Aliens

The zombies devastated the world, turning humanity into nothing more than food. But the humans fought back, and after a long and brutal war, the hordes of the undead fell. Ten years later, zombies are just a memory. But now, a cabal plans on bringing a new threat to the healing world. Their plans go far beyond obtaining wealth or power or causing destruction, and they control a new army of zombies. Only a few people stand in opposition to the cabal, but what can they do to stop them from summoning an invading force of aliens?