A true phenomenon, Netflix’s massively popular “Stranger Things” is shutting down for good with its final four episodes.

Christmas Day streams three and the extended 2-hour+ finale pops New Year’s Eve.

At a joint press conference, executive producer Shawn Levy analyzed the DNA that makes “Stranger” so special.

“A combination,” Levy, 57, suggested, “of the epic and the intimate.

“As much as people talk about the ‘80s and the Demogorgons and the darkness and the genre influences, we wouldn’t be what we’ve become if we didn’t invest in these characters the way that we do, in terms of how we tell the story and the way the story is received.

“It’s that conjoined duality — the big and the small, the loud and the quiet — that is its special ingredient.

“We had no idea when we made this show,” he added, “that it would be a hit.

“We didn’t do it because we thought it would be a hit.  We did it because we knew it could be special.  And the rest has been our reward.”

The kids who star in “Stranger Things” are, 10 years later, no longer kids. They’ve been on a surprising rollercoaster, riding success, celebrity and fame with grace, comradeship and responsibility.

The chemistry within this ensemble was “crucial to the magic” Noah Schnapp, 21, declared. “That was a major part of the casting with the ‘chemistry reads’ we did back in Season 1, making sure everyone worked so well together.”

Schnapp knows their ability to connect is apparent onscreen. “Not just in our scripted dialogue,” he pointed out, “but the improv that happens in the moment.

“We get to do that because we love each other and feel comfortable with each other. It allows for moments like that to shine. I’m just grateful that we all work so well together and get along. Because it makes the job easier.”

“We’re all, in our own way, outcasts,” Millie Bobby Brown, 21, allowed, prompting Levy to laugh out loud. “If you see or meet any of us, you’ll know how strange we are in our own way.

“That’s what speaks so well to the ensemble but also, to us as individuals and actors. Bring that together – that’s the DNA of our show.

“That is what makes our show so great. Audiences can feel connected to that flawed person, that person that just brings a little bit of (who they are) to the show.

“And you go, Wow! I feel incredibly connected to this person.’ So yes, I agree.

“When we’re on set, I don’t feel like there’s any perfect person.  And that’s what’s exciting — you are able to be entirely vulnerable because we all are.  And we’re all entirely ourselves.”