I ask the young men how they feel about the show ending and stepping into new projects, and Gaten is first to admit they feel some trepidation.
“I’m a bit shaky and there is a bit of anxiety, but I think that’s the point.”
The 23-year-old, who plays Dustin Henderson, says now feels like a good time to step into a period of unknown.
“Your twenties are all about change, transition and growing, and we’re incredibly lucky to be in a position to establish consistency in our careers.
“I see that as a real blessing and I look at it optimistically as I can because it is scary to not have the comfort of knowing there’s another Stranger Things season.”
The legacy of the show is undeniable – it’s transformed a cast of newcomers into stars and spawned a global fanbase who have grown up alongside it.
Caleb hopes that connection lasts and the show “lives on and becomes one of those things that people will rewatch and never get tired of, like a classic film”.
Knowing the impact of the show made saying goodbye even harder, and the final day of shooting is something Caleb won’t forget for a while.
“Everyone was there and it bought us back to episode one – that feeling of home, being supported and loved, and everyone was on the same page in terms of their connection with the show,” he says.
Netflix has announced an animated follow-up, while details of the Duffer brothers’ live-action spin-off are still under wraps.
It’s the end of an era for the current cast. But would they reunite for another project?
“Our part of the Stranger Things story is done for now,” Gaten says. “But if they called us in a while, who knows?”
The first four episodes of season five will be available in the US from 26 November, with the next three arriving on Christmas Day, and the finale on New Year’s Eve. In the UK those releases will be a day later.
