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Watching some Doctor Who compilations, and realized that the Doctor's companions are always human. Even with all the planets he's visited, he always picks a human. But then again, I haven't watched or read ALL of the vast amounts of Doctor Who media by any means, so I might be wrong. If anyone knows of the Doctor having an alien companion at any point, please let me know! I'd love to hear about it!

I think it'd be super awesome to have an alien companion in a future season, book, or even audio drama!