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This was a real landmark episode. In terms of quality, it was head and shoulders above 'Planet of the Dead,' it was beautifully plotted, featured terrifying monsters, and was thick with complex adult themes. Tonight, the Doctor attempted to change the rules of the game. Instead of being hampered by the restrictions of being a Time Lord, he tried to change an event fixed in time, and it all went Pete Tong. People died, and despite his best intentions, the tenth Doctor moved one step closer to his own destruction.