Sadie Sink was just 14 when her life changed by being cast as tomboy Max Mayfield in “Stranger Things.”

Now 22 and filming the final season of her long-running horror hit, Sink branches out with Friday’s theatrical thriller, “A Sacrifice.”

Set in contemporary Berlin, “Sacrifice” finds Sink as Mazzy Monroe who has left her divorced mother in California to live with her estranged dad (Eric Bana).  Unknowingly, both become prime recruiting material for a dangerous cult.

“For any teenager, regardless of the family situation, you get to a certain age and there is this need to rebel in a certain sense,” Sink said in a Zoom interview.

“For Mazzy, because her relationship with her parents is so strained, she feels she’s a casualty of their relationship and not being paid attention to or really understood.

“On top of that coming of age point where you want to figure out yourself and experiment with new things, she maybe makes a less than smart decision.”

Dating the first Berlin guy she meets is, Sink said, “A direct shot at her dad. It’s ‘I’m going to do this. And I hope he finds out.’

“She wants to be a little bit selfish after being in a dynamic where she feels she has no say or no control over anything.”

The cult is super-controlling and scary, homicidal even. That sense of Gothic horror was a draw for Sink.

“First, what attracted me — it was such a challenge physically and then the emotional stamina required in the ending.

“At the time, I was super into the idea of cults and would find myself frequently on these YouTube rabbit holes of all sorts of horrible, creepy things.

“So I had a casual interest in the idea. And I was a fan of this script — it read as if I’d been given a novel. Then the idea of Berlin was super exciting.

“To go film in a foreign city and be able to connect with the character in that way. She’s discovering Berlin — and I also would be there living in a new city on my own. Finding my own routine and sense of purpose in a new environment.

“It definitely was a challenge. I was thinking about this earlier today. Like, when you read the script for these action sequences at the end, it makes sense and you’re on the edge of your seat reading it.

“Then you actually have to do it! You’re like, ‘Wait a minute, this is a lot more difficult than I thought!’

“But I’m so glad I went through all of it. Because the stamina it required, it definitely taught me a lot.”

“A Sacrifice” opens Friday