Dot Strong

Dot Strong was the daughter of Harroll Strong and the twin sister of Jack Strong. She had a dead-white complexion, dark, serious eyes and red hair.

Dot accompanied her father and brother on an Earth-Mars expedition to Corbo, during which she and Jack were the only ones not captured by the devil-birds. The First Doctor found them, after rescuing the spaceship crew, and took them to the TARDIS. (PROSE: The Devil-Birds of Corbo) Before being returned to Earth, they had at least one other adventure with him when they travelled to Rhoos. (PROSE: The Playthings of Fo)

Behind the scenes
Jack and his sister Dot are never depicted in the illustrations accompanying the short story, however they are depicted on the cover of the annual.