Bio Apocalypse, a graphic novel.

In the year 2123, humans pushed science to the absolute limit...

But they pushed too far...

And released a scientific horror beyond comprehension!!

...

For people on Earth, it was hopeless.

In less than a week, all life on Earth was fused into on giant super-organism that covered most of the planet.

A lucky few hid in bunkers, where they eventually starved to death.

You stashed this under "Apocalypse" and not "Monsters"?

Oh, the humanity!