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I think that she could do decently as a companion, but she won't be even near the level of Rose or Martha for that matter. And I would say there was a notable gap between Rose and Martha.
But somehow, being from the U.S., I've already seen all the episodes of season three. It is pretty good, I don't think that anything they could have done would have been on the same level as the end of season two, but it isn't bad.
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"As I was walking up the stair,
I met a man who wasn't there.
He wasn't there again today,
I wish, I wish he'd go away."
-From Identity