Charlotte Lux

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

Biography
Charlotte was the youngest daughter of Strackman Lux's grandfather. Strackman Lux explained Charlotte was his aunt after the Doctor was shocked by discovering who CAL really was ("she's a child?!"). 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 well-being (the latter task through its personification in "Dr. Moon"). The library contained all of human history within it, which was perfect to keep Charlotte entertained, as she loved books more than anything and father gave her them all. Felman Lux also made sure that nobody outside of his family knew of the main command node's (Charlotte) true nature, as he wished for her to live in peace and not be treated like some kind of freak show.

When the Vashta Nerada began to hatch, CAL soon became aware of the problem and tried to warn the people of the library of the threat; the warning was only partially successful before the Vashta Nerada devoured the head librarian. She attempted to evacuate the people herself through the teleporters, but because the Library was now infested with Vashta Nerada,quarrantining seemed hopeless. So instead of saving them, CAL "saved" the 4,000 and more people on to her system and the other nodes, putting them in a dream world to keep their minds occupied until rescue came. She then put herself into sleep mode because of the stress of having so many minds in her own mind. She forgot her true nature, but was watched over by the Doctor Moon that continued to function despite the disaster.

In her perpetual dream, she described to Dr. Moon a world that she saw when she closed her eyes; a world later shown to be the Library, where she encountered the Tenth Doctor and Donna. They came across a levitating wooden sphere, which, with a security camera, was 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, that her "real life" was a lie, and that they needed her help. She then inturrupted the Doctor's teleporting of his companion to the TARDIS and unnesssesarily "saved" Donna Noble, uploading her to CAL's hard drive, and turned her into a Node with her mind free to experience a dream life similar to that which Cal lived. She 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 had happened to Donna had also happened to the 4,022 humans who had been "saved" by CAL in order to protect them from the initial Vashta Nerada attack a century earlier. River Song sacrificed herself to allow these people to be "downloaded", and the Doctor later stabilizes CAL's systems. In return, CAL provided a final home for the consciousnesses of River Song and her crew. Luckily, her sanity was returned to normal. (DW: Silence in the Library/ Forest of the Dead)