- Brigadier Lethbridge Stewart: This time loop... thing, how did you get out of it?
- Doctor Who: I simply boosted the circuits and broke free.
- Brigadier Lethbridge Stewart: And you came back of your own accord?
- Doctor Who: Well I...
- Jo Grant: Doctor?
- Doctor Who: No. No, I'm afraid not. No, obviously the Time Lords have programmed the TARDIS always to return to Earth. It seems I'm some kind of a galactic yo-yo!