It looks like a box in the middle of my screen. Is it even HD?
That's how they were showing the SD programs this afternoon, and BSG filled the screen because it is in HD.
edit- so, Dr. Who is not HD, thus it will not fill your screen. It is not 16X9.
The Dr. Who looked 16x9 (1.85 is close enough that it fills most 16x9 tv's) but it was shown in the 4x3 area and letterboxed. Hopefully they will correct that. I haven't watched Dr. Who since the 70's.