Dimitrios Kambouris/Getty; Juan Naharro Gimenez/WireImage Millie Bobby Brown struggles with separating reality from fiction when it comes to Jamie Campbell Bower’s Stranger Things character ...

And so he comes onto set, and I'm like 'Who is that?' They're like 'It's Jamie.' I'm like 'That's not Jamie, that is a Gremlin that lives in my closet and is waiting for me to fall asleep to kill me.' ...

I am terrified of his costume,” the actress revealed Dimitrios Kambouris/Getty; Juan Naharro Gimenez/WireImage From left: Millie Bobby Brown and Jamie Campbell Bower Millie Bobby Brown struggles ...