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The Doctor and Donna attend a carnival on the Chino-planet of Shan Shen, London, 2009, and are exposed to flags, pagodas and local colour. Donna is cajoled into having her fortune told for free, and her past is explored for just one single event. But when Donna’s entire world collapses around her, there’s no sign of The Doctor to help.

It’s not long before Donna meets a mysterious blonde, a traveller from a parallel universe – it’s Rose Tyler. Donna and the Doctor’s former companion quickly join forces – but with the darkness fast approaching, can they rescue the whole of humanity before it’s too late?

Billie Piper guest stars as Rose Tyler.