Iron Man 2 Cast Update April 24, 2009 Kate Mara and Clark Gregg join superhero sequel! Kate Mara and Clark Gregg are the latest additions to the Iron Man 2 cast. Details of Mara’s role are being kept secret but Gregg will reprise his role as S.H.I.E.L.D. operative Phil Coulsen from the first movie. Filming on the Iron Man sequel is currently underway in California, with returning stars Robert Downey Jr and Gwyneth Paltrow joined by Mickey Rourke, Scarlett Johansson, Sam Rockwell and Don Cheadle. Iron Man 2 is expected in cinemas May 7, 2010.