Platt's role is listed as "the Man in Black" and seems to be an original character created specficially for the film. News of his casting comes on the heels of this morning's report that Rose Byrne will appear in the film as Moira MacTaggert, joining an ever-expanding cast that includes James McAvoy, Michael Fassbender, Rose Byrne, Alice Eve, Kevin Bacon, Nicholas Hoult, Jennifer Lawrence, Caleb Landry Jones, Lucas Till, Edi Gathegi and Jason Flemyng.
The most conspicuous absence in the cast so far is an actor for the role of Scott Summers (aka Cyclops).
X-Men: First Class opens June 3, 2011.
Read more about: