Ace

One of the Seventh Doctor's companions.  A young English girl from Perivale who had been a problem child, she had run away after her experiments with homemade gelignite blew up part of her school.  Her real name is Dorothy.  She was one of the "Wolves of Fenric", descendents of the ancient Vikings who had brought the flask containing the evil entity back to England.  Fenric pulled her out of space and time and left her on Iceworld, where she took a job as a waitress.  She accompanied the Seventh Doctor (whom she called "Professor") on his quest for the Dragonfire and helped him defeat Kane.  She aided him against the Daleks, the Cybermen and the Gods of Ragnarok.  Ace held Excalibur and fought Morgaine at Carbury.  The Doctor then took her back to 1883 Perivale to confront her fears of the evil house, Gabriel Chase.  Afterwards, Ace became instrumental in Fenric's release in 1943 Northumberland.  There, she met her mother, Audrey, as a baby, and helped her grandmother, Kathleen Dudman, to escape the Haemovores.  She also fell in love with the Russian Red Army Captain, Sorin.  The Doctor and Ace then returned to Perivale, where she helped him fight the Master, and almost turned into one of the Cheetah People.   Ace's favorite weapon was explosives, in particular nitro-nine.  According to some accounts, Ace eventually left the Doctor to live in 1880 France, where she married one of Sorin's ancestors.