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Is Millie Gibson Leaving Doctor Who? RTD Reveals Ruby Sunday's Fate (Spoilers)
(www.doctorwhotv.co.uk)
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We've known since way before season 1 even started that she'd be leaving mid-season 2. The only thing that's new (to me at least) is that both Millie and Varada will be companions at the same time (which irks me to no end because I was convinced Varada would be Ruby II. Dangit.).