Set after the events of The Day of the Doctor, the 50th Anniversary special; The Doctor and Clara find themselves stranded on a mysterious planet, where they meet a lone band of humans, who are attempting to escape the desolate world. However, unknown to them, an ancient evil stirs in the deep; one which threatens not just the planet but the whole universe. Its coming... 

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Please note that the events of this story isn't canonical with the televised series, and is based upon my own ideas. Any characters, places and aliens featured in the series are copyright to their respective owners and the BBC. Other characters, places and aliens that are not featured in the franchise are completely original to this story.