Donna Noble’s no fool; she knows how lucky she is. Most people never even get a first chance to travel with the Doctor. When she turned him down all those months ago that should have been it.
At the time she’d been too raw from everything that had happened to her, but even that short time with the infuriating spaceman had opened her eyes to things she couldn’t possibly have imagined before.
Now he’s back, they’re investigating the same thing, but this time she’s ready. When he leaves she’s going with him, and she’s not taking ‘no’ for an answer.