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Name – The Girl – CAL – Aka Charlotte Abigail Lux
Species – living mind of a Human child.
Planet: The Library Planet
Temperament – confused
Appearances – Silence in the Library/Forest of the Dead

CAL was short for Charlotte Abigail Lux. She was the youngest daughter of Strackman Lux’s grandfather. She was dying, but he put her living mind into the computer and built the library for her to enjoy in everlasting virtual life. She created a perfect home for herself, with a perfect Dad. It was she who saved all the people in the library to the hard drive when the Vashta Nerada hatched.

When the computer was reset, Charlotte became on of River Song’s virtual children along with Ella and Joshua.