After five seasons, 'Stranger Things' is coming to an end - but another portal is already opening as the creators behind the show, twin brothers Matt and Ross Duffer, tell the BBC a spin-off series is already in development.

It's early days but we're excited about it, says Matt Duffer. It's new characters and a new mystery, so it's different, but it will be in the same world as 'Stranger Things'.

The pair feel that there is more to explore, but Matt's twin brother Ross explains they always saw the original story as a self-contained arc and it's definitely the end for these characters. The clarity around the ending had always been part of the plan, and Matt says the final scene was the one thing we had planned from the start.

We always knew what we were working towards so it was like our north star and we built the whole season around the final scene.

Season five is set in the autumn of 1987. Hawkins, Indiana, is scarred by the opening of the Rifts and the group of friends must find and kill Vecna. At the same time, the town is under military quarantine as the hunt for Eleven intensifies.

The brothers, who were in their early thirties when the show began, had always planned for four or five seasons, but say it still feels surreal that they managed to get that far.

What started as a nostalgic horror about a missing boy quickly grew into one of Netflix's biggest global hits. Ross shares, When you're making the show, you're so entrenched in it that you forget how far it's come, and every season we put everything we have into it.

The feeling of uncertainty about what comes next is shared by the cast. Gaten Matarazzo, who plays Dustin, admits, I'm a bit shaky and there is a bit of anxiety, but I think that's the point.

He reflects on the transition period of their twenties, emphasizing the importance of change and growth. Caleb McLaughlin hopes the show continues to resonate, akin to cinematic classics that people never tire of watching.

As they wrap up filming, the cast feels an undeniable bond created from shared experiences throughout the series, capturing their sense of nostalgia, friendship, and the imprint left by the show.

Netflix is set to release the first four episodes of season five on November 26, with the next three arriving on Christmas Day, and the finale on New Year's Eve. The Duffer brothers’ animated follow-up and live-action spin-off are still under wraps, but the excitement around the 'Stranger Things' legacy continues to grow as the show comes to a close.