"I think that was the idea from the start, to do something that wasn’t really being done. So we have a companion who’s much older than normal – the think I always repeat in interviews like this is that if Alice was being played by a real-world actor, she’d be much older than Matt Smith and there’d automatically be a kind of mitigating of the Doctor’s authority. Alice is someone who won’t take any of the Doctor’s crap – and there is some crap occasionally from him, and I’m glad Clara in the new series isn’t taking it either." - Al Ewing
So, with the Doctor back to his old self, the monster is defeated:

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Date: 2015-10-02 02:27 pm (UTC)It's because - much more than Ten - he comes off as a genuinely nice guy.
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Date: 2015-10-02 02:32 pm (UTC)no subject
Date: 2015-10-02 03:56 pm (UTC)no subject
Date: 2015-10-02 09:57 pm (UTC)no subject
Date: 2015-10-02 10:09 pm (UTC)And a Doctor with an older looking assistant is usually fun; Evelyn Smythe and the wonderful Donna Noble spring to mind.