The Doctor returns to Earth on Christmas Eve, but something goes wrong during his regeneration, leaving the human race vulnerable as the Sycorax advance on Earth. Rose Tyler: Billie Piper. Jackie Tyler: Camille Coduri. Mickey Smith: Noel Clarke.
Part 1 of 2. The Doctor, Martha and Captain Jack arrive in the U.K. as the Master assumes his post as Prime Minister Harold Saxon and delivers a startling announcement to the world. Sharon Osbourne makes a cameo appearance. John Barrowman. John Simm.
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