The mania surrounding guest stars on Doctor Who seems to be greater than ever these days. Who will be next?

Guest stars have been all the rage lately on Doctor Who. Maisie Williams, Joivan Wade, Bethany Black, and Reece Shearsmith being a few of the most recent. As we reported a few days ago, both Matt Lucas and Greg Davies will be guest stars in the upcoming Series 9 Christmas special. And, of course, will will also see the return of River Song in the same episode.

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