Veteran character actor Oliver Platt has now signed on to star in X-Men: First Class. Platt will play The Man in Black, a non-mutant role.
Rose Byrne is reportedly in negotiations to play scientist Moira MacTaggert in director Matthew Vaughn's X-Men: First Class.
Vaughn has already gathered quite an ensemble. James McAvoy, Matthew Fassbender and Jennifer Lawrence (Winter's Bone) have all signed on to key roles.
Byrne played opposite Russell Brand in Get Him to the Greek this Summer, and she'll soon be seen alongside Kristen Wiig in Bridesmaids.