Mica Davies was the daughter of Rhiannon and Johnny Davies. She lived with her family in one of the poorest and roughest parts of Cardiff, in the Cromwell Estate. Like all other human children, the 456 used her as a communications vehicle. (TV: Children of Earth: Day One) She was rescued from her home by Gwen and Rhys during the "inoculation" collections by the Military. She was saved, like all other human children, by Captain Jack's sacrifice. (TV: Children of Earth: Day Five)