Dorothy Noone
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Professor Dorothy Noone was an entity composed entirely of language.
She was created by Henry Noone, who wrote a detailed account of what his girlfriend, Ace, would be like 10 years after marrying him. This account was read into the Hand of All by Hex. In the Hand of All, Noone was able to access Nobody No-One's CORDIS. This allowed her to create a physical avatar. As a creature of language, she had the power to reshape reality. She used this ability to resurrect the Seventh Doctor. She was destroyed by Nobody No-One when he reengaged the CORDIS' security system, but not before she once again trapped him in the Hand of All. (AUDIO: A Death in the Family)
