The aliens aren't coming, they're already here.
Fortnite lore is weird. Yes, the battle royale game does have lore and a lot of it. The latest story beat kicked off today with Chapter 2 Season 7. The latest season is entitled "INVASION" and yes, it involves aliens. It also includes a Rick and Morty crossover as well? There's probably more but it's hard to keep up with all of it.
Anyway, according to today's announcement, "the fate of the island is...