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If Rose can be selfish, then her finest moments will come when she’s selfless. If Martha keeps quiet, then her moments of revelation – like her goodbye to the Doctor in Last of the Time Lords, or stuck with Milo and Cheen in Gridlock – make her fly. Donna is magnificently self-centred – not selfish, but she pivots everything around herself, as we all do – so when she opens up and hears the Ood song, or begs for Caecilius’ family to be saved, then she’s wonderful. 

Russell T. Davies