
Nightcrawler actor Alan Cumming has potentially given away another X-Men star who could be making an appearance in Avengers: Doomsday.
So far, we know that James Marsden's Cyclops, Rebecca Romijn's Mystique, Kelsey Grammer's Beast, Ian McKellen's Magneto, and Patrick Stewart's Charles Xavier are all returning, along with Channing Tatum's Gambit.