Stranger Things Spinoff Will Answer What's Inside the Briefcase and Other 'Loose Threads' From the Season 5 Finale, Duffer Brothers Promise

If you’re all caught up on Stranger Things, you’ll be aware of a plot thread left dangling in the Season 5 finale that has to do with a briefcase. It turns out this will be addressed in a live-action Stranger Things spinoff — although there’s no word when.