Nun
From Tardis Wiki, the free Doctor Who reference
Nuns were female members of a monastic religious order. In the looser sense, nuns could also be members of a religious sisterhood devoted to service such as treating the sick.
On Earth in the 20th to early 21st century a sisterhood of nuns were manipulated by a Gorgon, it was defeated by Sarah Jane Smith, Luke Smith, Maria Jackson and Clyde Langer. (SJA: Eye of the Gorgon)
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A Sister of Plenitude
On New Earth in 5,000,000,023 an order known as the Sisters of Plenitude operated the hospital outside New New York. (DW: New Earth)
