After more than a year of rumors, hints and reports, Anya Taylor-Joy and Maisie Williams have officially joined the cast of New Mutants, one of a few upcoming projects set within the X-Men universe. The Fault in Our Stars director Josh Boone has long been attached to helm the project, teasing the Game of Thrones star’s potential involvement as recently as February. It’s another big step forward for New Mutants, which joins X-Force and Channing Tatum’s on again / off again Gambit movie in Fox’s lineup of forthcoming mutant spinoffs.

THR reports that Game of Thrones favorite Maisie Williams and recent breakout star Anya Taylor-Joy (The Witch, Split) have officially signed on for New Mutants, which is set to begin production in July. Boone is directing the highly-anticipated project from a screenplay he wrote with screenwriter and former Jackass producer Knate Gwaltney.

As previously rumored, Taylor-Joy will play the role of Magik, a proficient sorcerer who has the ability to teleport; she’s also the sister of fellow mutant Colossus, most recently seen in last year’s Deadpool. Williams will play Wolfsbane, a young mutant whose religious upbringing conflicts with her newfound ability to transform into a wolf. The New Mutants lineup will also feature Danielle Moonstar, Cannoball, Sunspot, and Warlock.

The film is also set to feature James McAvoy, reprising his role as young Charles Xavier from the X-Men franchise — news previously confirmed by producer Simon Kinberg and McAvoy’s Split co-star Taylor-Joy.

Back in December, Boone revealed that he conceived New Mutants as a trilogy of films, drawing inspiration from Chris Claremont’s run with the series which included the villain Demon Bear — though that antagonist was featured in an animatic Boone created for Fox execs, it’s unclear if he’ll be the primary baddie in New Mutants.

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