Downton Abbey is already really great, and things tend to get better because of Paul Giamatti.
Downton Abbey doesn't really need to get any better than it is now, but it's going to anyway. Paul Giamatti is joining the PBS Masterpiece masterpiece for the finale of its fourth season. He's unfortunately apparently only appearing in that one episode, but hopefully we can expect him to return for season five. So who is he playing?