One time "Superman" contender Keanu Reeves will be putting on the cape of a Doctor instead for the still-untitled Nancy Meyers comedy to star Jack Nicholson and Diane Keaton. According to The Hollywood Reporter, Reeves will play an emergency room doctor who treats Nicholson’s character when he has a heart attack.The other two lead roles yet to be cast include the young girlfriend and the sister of Keaton’s character.