That one wasn’t bad, although I think we’ll have to see the second part to really judge.
It was good to see Martha again. She acted very much older than she was, I thought. Donna’s at least five years older than her, and yet Martha was the one who seemed more adult. Not necesarily in a good way, either. I think all her experiences are eventually gonna weigh on her. The Doctor goes on about not liking people with guns, and yet all his companions seem to wind up soldiers. Martha, Jack, Mickey, (if the spoilers I’ve seen are to be believed…) Rose. I liked that Martha and Donna got along instantly.
Donna was very good too, as were her mother and grandfather. I really liked the bit when she walking down the road and flashing back to her previous adventures.
Sontarans…are not scary.
That’s about it. :p