The X-Men spinoff film New Mutants is moving forward and has now signed two actors.

According to The Hollywood Reporter, Maisie Williams (Game of Thrones) and Anya Taylor-Joy (Split) have joined the film. Josh Boone (The Fault in Our Stars) is directing, with production set to begin in July.

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The movie follows teen characters Moonstar, Wolfsbane, Sunspot, Cannonball, Magik, and Warlock. Williams is lined up to play Wolfsbane, who is apparently struggling to “reconcile her religious beliefs with her power to turn into a wolf.” Taylor-Joy is playing Magik, the sister of Colossus who has teleportation powers.

It has been reported that the movie might be a departure from the more traditional superhero action of the other X-Men films, with a story in ComingSoon describing it as a “teen horror movie.” This ties into comments made last year by X-Men producer Simon Kinberg, who said that it would have “its own unique, original voice.”

In December, an animatic of a potential action sequence from the movie was released, the authenticity of which was confirmed by Boone.

New Mutants opens on April 13, 2018.