Timeline for 1638
17th century | 1630s

• 1637 • 1639 • 1641 • 1642 • 1643 • 1644

On 23 November 1638, the Doctor battled Lady Peinforte with the help of Roundheads, then launched the Nemesis from a meadow in Windsor. The Doctor calculated the statue would pass Earth every twenty-five years before returning in 1988, then set his watch to remind himself. (TV: Silver Nemesis)

Some time after her initial defeat by the Doctor, Lady Peinforte hired a mathematician to calculate when the Nemesis would return to Earth. Once a date of 23 November 1988 had been calculated, she and her henchman Richard Maynarde killed the mathematician and used his blood in a black magic ritual to transport themselves to 1988, with the help of a time storm created by Fenric. (TV: Silver Nemesis, The Curse of Fenric)
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