Donna Noble, later The Doctor-Donna and Donna Temple-Noble, was a companion to the Tenth Doctor and the deuteragonist of the Series 2 Christmas special The Runaway Bride and Series 4 (2008) of Doctor Who.
She was portrayed by Catherine Tate.
Despite her ordinary origins, she was described by both Rose Tyler and the Tenth Doctor as being the most important woman in all of creation, due to the fact that she saved the whole of reality from the Daleks and Davros.
To survive the side effects of her transformation into the "DoctorDonna", her memories of her time with the Doctor were forcibly erased and she was returned to Earth.
She later married Shaun Temple, and became Donna Temple-Noble.