Following the events of Stargate Atlantis, the city of Atlantis arrives on Earth, and sits in the harbor outside San Francisco.

A few months ago, a new Tech company came onto the scene, outpacing every major tech company, and buying up several of them. After testing the new technology, Area 51 finds that it is based on Go'auld technology. Aegis Inc. comes under investigation, and it is discovered that the CEO is actually a minor Go'auld named Hephaestus. When the SGC tries to interfere, he goes public with information about aliens, the fact that his tech is alien in origin, and the fact that he's an alien. The countries of the world have no choice but to go public with what they know.

Civilians start using this tech to travel to other worlds and, due to public outcry over the government coverup, the Star Gate is moved to a neutral space station in orbit above Earth. Other space stations are built to facilitate ring teleportation between Earth's major cities. New colonies are started on other worlds using ships and the Stargate.

We are the new SGC, tasked with providing security for the new colonies and the Earth.