Vicki (Maureen O'Brien) first appeared in "The Rescue". She was a survivor of a spaceship crash on the planet Dido in the 25th century. She is rescued by the Doctor. She travels with him, Ian, and Barbara. In "The Myth Makers", Vicki meets an ancient warrior of Troy named Troilus. She decides to stay behind with him. She eventually passes into legend as Cressida. She also makes sure that the Trojan girl Katarina enters the TARDIS in her place. 