VISHINSKY: There it is, Zeta Minor. The last planet of the known universe.

DOCTOR: Listen, we're on the edge of a time-space vortex and you're talking in minutes.

SARAH: Oh, I see. What's gone wrong this time?

DOCTOR: Nothing. Nothing at all. What makes you think something's gone wrong?

SARAH: Because you always get rude when you're trying to cover up a mistake.