McAvoy has officially joined the cast of BBC OnesHis Dark MaterialsTV series, EW has learned.
What began withThe Golden Compasscontinued withThe Subtle KnifeandThe Amber Spyglass.
Her journey becomes even more expansive when she learns of parallel universes and the mysterious substance known as Dust.

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Keen gained international recognition playing the young mutant X-23 in the R-ratedLogan, which starred Hugh Jackman as Wolverine.
And the sheer talent now working in the world of long-form television is formidable.
For all those reasons Im delighted at the prospect of a television version ofHis Dark Materials.
As for the BBC, it has no stronger supporter than me.
I couldnt be more pleased with this news.
This article has been updated with casting information on Ruth Wilson.