Summary: The Survivors of Oceanic 815 have settled into a normal life in Los Angeles and Seattle. Even Ben Linus seems to have found something close to normal. So now that they've found peace in their own lives, can they help find the doctors they've let in to their confidence – and maybe help repair Seattle Grace's reputation? Sixth in Series

Facing the crisis of an alien invasion Oliver and Barry have brought Sara Lance and the rest of the Legends back to present-day Earth to help Mulder, Scully and the newly assembled task-force try to stop the fast-coming invasion. Can the Legend help save the day, or will a group that can't handle a crisis without conflict end up killing each other instead of the Colonists?

It's been nearly three years since the Losties returned to civilization. They've found new jobs, gotten married, had children. They have every reason to believe the island is done with them. The problem is there are people out there who aren't done with the island. They want to get back there. And some of them were on Oceanic 815 before.