The Doctor is working on the TARDIS console, sitting in the lab. Doctor: There, there old girl. Sealed you up. A girl walks into the lab. Doctor: I say, who are you? Girl: Mary-Louise. I'm your new assistant. Doctor: Liz just left three weeks ago. Doing some work in Africa. Mary-Louise: I have basic knowledge of alien technology, engineering and science. I don't know too much about science though. Doctor: Then go to the military department then. Mary-Louise: My uncle said that I would be a great help to you. Doctor: Uncle? Mary-Louise: I'm the Brigadier's niece. Mary-Louise: What's the TARDIS?