Maybe its the Death Star ( Star Wars) incarnate......
Using a cloaking device ( Star Trek) to hide its arrival.....
The knowledge of its arrival is set in ancient stone carvings ( Stargate SG1 / Atlantis)............
We will survive or be saved by Ancients ( SG1, Atlantis,SGU) / United Federation of Planets ( Star Trek) / Luke Skywalker (Star Wars) ...................
All moderated by Sisko (DS9)
Bartman