Not much is known about her mysterious role in the upcoming action flick, and although a new interview doesn't reveal a heap of information, we now know a bit about her motivations.
"There's ambiguity… the interesting thing we're exploring is her resistance to a situation she finds herself in," Atwell said on the Light the Fuse podcast.
"How she starts off, where she becomes. The journey of what she comes into and what is asked of her and potentially where she ends up."
Director Christopher McQuarrie elaborated: "For Hayley to exist in a franchise where other women had come and made statements, we said 'well it can't be like that.' We don't want Hayley to be a repeat of any character that’s come before.
"What's left? What's unique and what's new? We wrote a scene about what we imagined the spark of that character to be, and that's what Hayley came in and read.
"What we discovered there is this energy that Hayley had, specifically an energy with Tom. It's not a vibe, it's literally a vibration. You felt it and you were like, 'I don't know what to make of this person'."
One thing we do know about Atwell's character is that she will appear in the next two Mission: Impossible movies.
Explaining why 7 and 8 are being split, McQuarrie said in the same interview: "When we went into making Fallout, I said to Tom [Cruise], 'I really want to make this more of an emotional journey for [Ethan Hunt]'.
"Going into this, I said, 'I want to take what we learned from Fallout and apply it to every character in the movie. I want everyone to have an emotional arc... I just want the movie to have more feeling across the board'."
Mission: Impossible 7 is currently set for a November 19, 2021 release date, while the eighth movie is pencilled in for 2022.
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