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Removed discussion from the answer Edit

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I'd second the Brigadier on that list, not least because of "Closing Time" last year. I'd also maybe add Donna Noble.
But overall, I reckon the Doctor's not the sort to have a /favourite/ companion. I reckon he'd be one of those people to love all their friends just as much, just in different ways, and not kind of "rank" them in his head.

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What does the Brigadier have to do with "Closing Time"? Did you mean the Wedding of River Song? 14:16, April 10, 2018 (UTC)