- Brigadier Lethbridge Stewart: In any case, Doctor, every section of U.N.I.T. now has the search for The Master written into standing orders.
- Dr. Who: Priority Z-144, I suppose.
- Brigadier Lethbridge Stewart: Priority A-1, actually.
- Dr. Who: Look, I tell you Brigadier, there is grave danger.
- Brigadier Lethbridge Stewart: Danger of what, for heaven's sake?
- Dr. Who: Well I'm not sure, but in my dream, I quite clearly... .
- Brigadier Lethbridge Stewart: If it ever got out, you'll be the laughing stock of U.N.I.T. "A dream". Really, Doctor, you'll be consulting the entrails of a sheep, next.
- Jo Grant: [Bursts out laughing]
- Jo Grant: You know Doctor, you're quite the most infuriating man I've ever met. I've asked you at least a million times, what is it?
- Dr. Who: Extraordinary, I could have sworn I'd told you. It's a time sensor.
- Jo Grant: Oh I see.
- Dr. Who: Do you? What's it do, then?
- Jo Grant: Well it umm ..
- Dr. Who: Mm-hm?
- Jo Grant: It umm, it detects disturbances in a time field.
- Dr. Who: Well done Jo, you're learning. It's exactly what you need if you happen to be looking for a TARDIS.
- Jo Grant: It's a TARDIS sniffer-outer.
- Dr. Who: Yeah or any other time machine, for that matter. So, if The Master turns up again...
- Jo Grant: Bingo!
- Dr. Who: As you so rightly say, bingo!