If you head to Mega Mall's.er, Mall, you'll find Gates - complete with floating spores - attached to the walls of various stores.
As spotted by Fortnite Intel, players have noticed the portals appear around the Mega Mall, a location added to the in-game landscape in season 9.
The upside down portals don't deliver players to the Upside Down, but they do spirit them away to other locations within the mall itself.
It's unclear if the extent of the crossover is just a few portals or a few portals, skins, and an LTM.
Since then, players and fans of the show have been eagerly awaiting to see what the crossover would behold and data-miners have found sound files and references to a cosmetic set in the game belonging to Stranger Things.
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Following the gang from Hawkins, Indiana, season three of Stranger Things sees Eleven, Mike, Will, Lucas, and Max continuing their battle against otherworldly happenings, blossoming relationships, and growing pains - all set against the backdrop of 80s U.S. suburbia.
Epic Games have released a teaser image for the upcoming Fortnite X Stanger Things collaboration.
This isn't the first crossover between the worlds of Fortnite and Stranger Things.
There's already a Scoops Ahoy Ice Cream Parlor, which is also found within the new Mega Mall POI, so it was only a matter of when and not if there would be a collaboration. It's likely that more Stranger Things tie-ins will appear ahead of tomorrow's series launch.