Back when AIDS first hit the scene and everyone was wondering where this "monkey virus" came from, a friend of mine hypothesized that this kind of thing will happen more and more as we uncover and disturb lifeforms deeper and deeper in the jungles and under the sea. And that, indeed, seems to be the case. Suddenly we are surrounded by deadly viruses we've never heard of... Ebola, West Nile Virus, Monrovian Bird Flu.
Over time, the native peoples who live in these areas have built up an immunity to them and have developed a co-existent, even symbiotic, relationship with them. But to the uninitiated visitor, these things can have totally unpredictable, even deadly, effects. And given the ease of today's international travel, they can be spread world-wide before scientists even suspect that they exist much less know where they came from.
Now we learn of a danger from an entirely new and heretofore unsuspected source, the Polar Icecaps.
A newspaper headline reads, "NASA Expedition Finds 70 Miles Of Marine Life In Once Frozen Region." It seems that the melting icecaps are releasing billions of once frozen phytoplankton and suddenly the northern coast of Alaska is alive with creatures released from their frozen state, some of which could be millions of years old. This is truly alarming. There's no telling what sort of ancient viruses or fungus or eggs of monstrous creatures could be hidden within the millennia-old ice. Some have speculated that as the icecaps melt ancient, frozen, alien space ships will be exposed. Maybe even... The Thing!!
Suppose some sort of brain parasite is released? One that would eat the higher regions of your mind leaving only the crazed moto-driven cravings of sex and blood!! Or some type of neurotoxin that places us all in a near-death Zombie state where we are driven only by our most basic instincts?
Zombies could come in all forms. Some, easily recognizable.
Others, not so much so. Zombeism could come on slowly so that the transformation isn't noticed at all, until it's too late.
Some, may already walk among us.