Game of Thrones and The Witch stars join Fox's New Mutants film - UPDATED

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Apr 1, 2016, 1:28 PM EDT

While we've mostly been paying attention to X-Men: Apocalypse lately when it comes to Fox's Mutant movie universe, it's not the only project developing at the studio, and I'm not just talking about the inevitable Deadpool sequel. The Fault in Our Stars director Josh Boone has been developing a script for The New Mutants with co-writer Knate Gwaltney (a producer best known for his work with Jackass crew who recently transitioned into scripting), and the process just reportedly took another step forward: It snagged its first stars.

According to HitFix, Maisie Williams, best known for her work as Arya Stark on the hit HBO series Game of Thrones, has joined the film as original New Mutant Rahne Sinclair, aka Wolfsbane. The report also notes that Anya Taylor-Joy, fresh off her breakout role in horror hit The Witch, is onboard as Illyana Rasputin, aka Magik. 

Wolfsbane is a shapeshifter able to move between her human form and that of a wolf-life creature, which enhances her senses and physical abilities, but at a price: She has an animalistic nature she must learn to control. Magik has the ability to teleport and, thanks to time spent in a Limbo dimension, is very capable with sorcery, including astral projection and spellcasting. She's also the younger sister of Colossus in comics continuity.

The New Mutants were formed in 1982 as a spinoff of the enormously popular Uncanny X-Men. Since the original X-Men had become adults and were no longer students at Charles Xavier's school, creators Chris Claremont and Bob McLeod devised a new class of gifted youngsters to be trained at the school, and many of them have gone on to be indispensable parts of Marvel Comics continuity.

It's not clear yet where this film might fit in X-Men movie continuity, or just how big the cast will get, but HitFix also reports Boone has drafted X-Men: Apocalypse star Alexandra Shipp to reprise her role as Storm, and James McAvoy is also expected to return as Charles Xavier. As for the rest of the New Mutants team, original members Cannonbal, Mirage, and Sunspot are also being cast.

So the New Mutants flick is taking is shape, and it's doing so with a couple of rising young actresses that genre fans already love. What do you think of the casting choices?

UPDATE: In a statement to Nerdist, a Fox representative simply said the casting reports were "not true." Whether that means Williams and Taylor-Joy have no connection to the film at all isn't clear (they could have met for the roles, or something similar), but even if there are any actual casting developments on the film, the studio doesn't want us to know about them just yet.

(Via HItFix)