Peter Dinklage

Peter Dinklage is joining the cast of the new X-Men movie, Days of Future Past, according to director Bryan Singer. There's no word on who the Game of Thrones star will play.

"Officially like to welcome #PeterDinklage from #GameOfThrones to #XMEN #DaysofFuturePast Very very excited!" Singer tweeted Wednesday.

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Previously announced cast members include Ian McKellan and Patrick Stewart, as well as returning X-Men players Michael Fassbender, Hugh Jackman, Jennifer Lawrence, James McAvoy and Nicholas Hoult.

Days of Future Past is scheduled to hit theaters in summer 2014.