Thunderfoot
Hero
The prologue appears to be an American broadcasting thing, if I heard correctly.
If so this is one American that thinks they need to S*#$-can it tute-suite! I've never needed an intro before now, don't treat me like an idiot....
That said, I loved the episode! Has anyone noticed that the power console is the same one used last season for the monster that ate and then assumed the identities of people? I have a feeling that this is not just a re-use of props as has been the case in the past. I see this season trying to tie all of last year's episodes together somehow, even more so than the final episode last season.
The astronaut is the doctor, the one he shot was a clone. That's my guess. As for the pregnancy, did anyone notice that River got sick after seeing the aliens multiple times too? Hmmmmm
And as cliche as it seems I think that River does kill the Doctor, but after the first episode, which Doctor does she actually kill? If my above guess is correct, maybe it's another clone.
One reason I love Dr. Who so much is I'm, usually really good at figuring out what the heck is going on in a TV episode long before anyone else (CSI, Mentalist, etc), with Dr. Who, not so much.