The Doctor is not complete without his companions, and we've seen plenty over the years.

The human accompanying the Time Lord on his adventures often keeps the show grounded, and can make for some of the best characters on the show.

With Varada Sethu joining the cast as Belinda Chandra, some will be wondering what that means for Millie Gibson's Ruby Sunday from last season.

Well fear not, despite some reports saying she was leaving, Ruby will be back again in the upcoming series. Here's all we know.

Reports began circulating last year that Gibson was leaving Doctor Who and being replaced after just one series.

However, the BBC later confirmed that while Sethu would be joining the cast as the new companion, she would be on the show alongside Gibson.

The former Coronation Street actor will be part of the cast in season 15, although it is not known how much she will appear over the eight-episode series.

Speaking to

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