Gridlock (TV story)

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Synopsis
The Doctor travels back to New Earth, eventually to meet the Face of Boe for one last time. Meanwhile, the streets are being ruled by sinister pharmacists, and The Doctor meets two people remarkably similar to the Sisters of Plenitude....

Cast
The Doctor - David Tennant Martha Jones - Freema Agyeman Thomas Kincade Brannigan - Ardal O'Hanlon Valerie - Jennifer Hennessy

Trivia

 * It is rumoured that the Face of Boe's secret will be revealed in this episode.