Sadie Sink says Jamie Campbell Bower was "genuinely horrifying" on set of Stranger Things season 4

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Stranger Things season 4 spoilers ahead!

Sadie Sink may have very well been one of several actors who were terrified of Jamie Campbell Bower on set of Stranger Things season 4 (opens in new tab)– and it made their interactions with Vecna all the more powerful on screen.

In a new interview with The Hollywood Reporter, Sink revealed that were two key components when it came to Vecna's believability. First, she says, were the prosthetics (done by Barrie Gower who also provided the zombie effects for Doctor Strange in the Multiverse of Madness) and practical effects used in lieu of stunt people in green screen suits.

"Having Jamie actually there was very helpful because he was genuinely just horrifying," she told THR. "It’s just not normal what you’re looking at, so you’re kind of tricking your mind in a way, and it makes stepping into Max’s shoes that much easier."

The biggest part, however, was Bower's method acting. 

"You can put anyone in that costume and they can be scary, but with Jamie, he was so in it all the time, not only when the cameras were rolling," Sink explained. "He liked to kind of stay in character a lot, and there would be times and longer setups and stuff where he would filter in and out of it, but for a lot of the Mind Lair stuff, there was not a lot of talking going on between us. 

"It was mostly just him as Vecna, standing in the corner and like growling or something like that, and he was just very, very, in it. And he would kind of talk in that voice a lot. So, to have someone as committed as Jamie in a role like that, just made it really believable. I think that was probably the key."

Bower told The Hollywood Reporter that he "went as far as he possibly could" to capture Vecna's darkness.

"I had