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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.
Conclusion. The third-season finale is set one year after the Master's rise to power, with Martha Jones cast as a wandering folk hero, who is believed to be the only human capable of defeating the evil Time Lord. John Barrowman. John Simm.