Warning: The following post contains spoilers fromStranger Things 2.
Stranger Things 2starts off with a boom, literally.
The leader of this group?

Netflix
The two are sisters, which we learn in episode 7 ofThings 2.
When we started season 2, we wanted to explore whether Eleven had siblings, explains Matt Duffer.
That led to the creation of that character and the casting of Linnea.
The 24-year-old Berthelsen is from Copenhagen, Denmark, andThings 2marks her biggest role to date.
The actress was late to watch the first season but her timing oddly worked out.
I feel like it got popular in Copenhagen maybe a couple months later, says Berthelsen.
I remember telling my boyfriend in October, Lets watchStranger Things.
Like literally two days later, I got the [audition].
Before filming, Berthelsen did her own pop culture research.
I watched all the movies they used for season 1, she says.
And I went back to readCarrie.
I took a lot fromStar Wars,which Im a huge fan of.
I found my own references.
She jumped headfirst into the dark, troubled character, which included creating Kalis dramatic hairdo.
And then I said, you’re able to go crazy, I dont care.'
Will we see Kali and her gang again in season 3?
I dont know yet, says Matt Duffer.
I dont feel like theres closure there.
Its definitely a dangling thread.
Were just figuring it out.