Teenage girl (Beige Planet Mars)

A teenage girl and an old man were offworlders involved in repelling the Dalek invasion of Mars. They downed a flying saucer at Argyre Dam and helped with coordinating the final attack. She was plump, and her hair was black and curly. (PROSE: Beige Planet Mars)

Behind the scenes

 * This teenage girl is the character Iphegenia, "Iffy" for short, from Mark Clapham's fan novella Integration. She had previously been planned to appear in the epilogue of The Dying Days, where she would've been the wife of the 42nd Doctor, who apparently accompanies her in Beige Planet Mars.
 * Iphegenia was based on.