Claire/Emmeline
It's not like any of us had a bloody meeting about it. It's just my guess, and I've only known what's been going on for a couple of days now and making sure that my not-husband is okay after he got hurt in a fire.
Before all of this there was a place called Atlantis. We get there because we picked up a coin and was told that something about all of creativity being a risk, all of our worlds being in danger and our help was needed to fight.
Though to be honest I'm not entirely sure how people were still brought in during this mess. Not any kind of magic I've seen.