They were our children's children, and they came one day from nowhere- walking through holes in the air into our world. By means of one-way time tunnels, they fled the ravening beasts with teeth, claws and tentacles, that reproduced like bacteria and were intelligent.

They fled to escape the uncontrollable horror of their own far future, and we, their distant ancestors, housed and fed and comforted them, content in their assurance that the tunnel was securely guarded from the beasts, whatever or whoever they were.

But then somebody up there slipped up and the beasts were abroad...