Air Date: May 26, 2007

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To evade alien mercenaries seeking his regenerative ability, the Doctor transforms himself into a human being with no memory of being a Time Read More

To evade alien mercenaries seeking his regenerative ability, the Doctor transforms himself into a human being with no memory of being a Time Lord, then hides as a schoolteacher in the early 20th century while Martha stays nearby as a maid to monitor him. But the mercenaries arrive, while a schoolboy gets hold of the watch containing the Doctor's essence. Read Less