Netflix has set the premiere date and released a trailer for its previously unannounced documentary that followed the making of the final season of “Stranger Things,” directed by Martina Radwan. “One Last Adventure: The Making of Stranger Things 5” will drop on Jan.

Netflix's 'Stranger Things' Season 5 documentary, ‘One Last Adventure: The Making of Stranger Things 5,’ shows Duffers and cast making final season.

Netflix is taking fans behind the scenes of the biggest show in the world following season 5 wrapping up over the festive period. Here’s everything you need

Matt and Ross Duffer explain their struggle with how to end the series in the upcoming "One Last Adventure: The Making of Stranger Things 5."

Stranger Things recently wrapped up its divisive fifth season with a finale that's been praised and panned in equal measure. While some appreciated Eleven's ambiguous send-off, others feel the Duffer Brothers left far too many unanswered questions in an already bloated send-off for the long-running series.

A new Netflix film explores how the Duffer brothers and cast concluded "Stranger Things" — including debates over how the series would end.