Charlotte Lux

Charlotte Abigail Lux, also known as CAL, was a Human who became a Node.

Biography
Charlotte was the youngest daughter of Strackman Lux's grandfather. Felman Lux built his dying daughter The Library and its hard drive to contain and embody her living mind, and a Doctor Moon to maintain The Library and her spiritual wellbeing (the latter task though its personification in "Dr. Moon".)

In her perpetual dream, she described to Dr. Moon a world that she sees when she closes her eyes; a world that is later shown to be the Library, where she encountered the Doctor and Donna, they came across a levitating wood sphere, which, with a security camera, acted as her means of communicating with them. In the dream world, she could contact the Doctor through her television screen, where they engaged in a brief conversation which was ended when the technology malfunctioned.



Shortly after this encounter with the Doctor, Dr. Moon came to have a talk with the girl alone and shocked her by telling her that the people inside "her" Library were very real, and that they needed her help. She then "saved" Donna Noble, uploading her to her hard drive and turned her into a Node with her mind free to experience a dream life similar to that which she lived herself. She also did the same with those members of River Song's crew who were killed by the Vashta Nerada. The Doctor and River Song realised that what happened to Donna also happened to the more than 4,000 humans who were "saved" by CAL in order to protect them from the initial Vashda Nerada attack a century earlier. River Song sacrifices herself to allow these people to be "downloaded", and the Doctor later stabilizes CAL's systems. In return, CAL provides a final home for the consciousnesses of River Song and her crew. (DW: Silence in the Library/ Forest of the Dead)