In CrossGen Comics Atlantis is set as the primary point of origin for the narrative events that unfold in the Sigilverse. Many of the popular ideas and beliefs that are associated with Atlantis are used in this iteration such as being an advanced culture and sinking beneath the sea. In the Sigilverse Atlantis was a great civilization that existed roughly 100, 000 years ago. After a period where they were at the height of their civilization many chose to ascended and thus become beings of pure energy. This setting bares many similarities to that of the later Stargate: Atlantis.
The Sigilverse Atlantis is an important factor in the construction of the universe's history. Many events that took place thousands of years ago in Atlantis had an impact hundreds of years later. Many of these impacts take place in Sigil and Crux with Kiss Kiss Bang Bang telling the story of an Atlantean in the 1960s.