I must admit, I was thinking "hang on, isn't this The Time Traveller's Wife?" at points. It helps that the casting was spot on.

(Note: however, it could be that *spoiler* was that she could use *spoiler* at the right point to make him trust her. But it's much nicer to think *spoiler*). I think you know what I mean.

The only drawback with this two parter is that the "Donna is dead meat" aspect is getting more, and more, and MORE obvious.