The Doctor brings Charley to the Hilton in Singapore, her original destination when she originally boarded the R101, to meet Alex Grayle. Whilst Charley enjoys her date, the Doctor encounters the immortal Sebastian Grayle, an old adversary of the Doctor whom the Doctor has not met yet.

Unfortunately for the Doctor, Sebastian Grayle succeeded in killing him years before this meeting and he has only come here to gloat.  The Doctor realises that there is something drastically wrong with time and he and Charley have to fix it.

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