Time on a Vine (short story)

 was a Brief Encounter short story published in the Doctor Who Yearbook 1992.

Summary
A young female executive is dying from exposure on an alien planet when the Doctor rescues her. He tells her that she has been deliberately snatched from her own time to prevent her from setting her company on a course that will, in two hundred years' time, change the course of an interspecies war. She travels with him for a year and a half before he manages to return her home, a tougher and more confident individual because of her time with him.

Characters

 * Fifth Doctor

Continuity

 * The Doctor mentions Tegan as being one of his former companions, so this would appear to be at some unspecified point after TV: Resurrection of the Daleks while Turlough is presumably having a break from the TARDIS.