- Leela: Doctor, what is the Peking...
- Doctor Who: Homunculus.
- Leela: Homunculus.
- Doctor Who: It was made in Peking for the Commissioner of the Icelandic Alliance. It was in the ice age about the year 5000.
- Professor Litefoot: Preposterous.
- Leela: Shh. Go on, Doctor.
- Doctor Who: Peking Homunculus was a... was a toy. A plaything for the Commissioner's children. It contained a series of magnetic fields operating on a printed circuit and a small computer. It had one organic component - the cerebral cortex of a pig. Anyway, something went wrong. It almost caused World War Six.
- Professor Litefoot: What?
- Doctor Who: Yeah. Somehow the pig part took over. So Weng-Chiang has brought the Peking Homunculus back through time. He could have done. Disappeared completely. It was never found.
- Doctor Who: This pig thing is still alive. Needs an operator, of course. But the mental feedback is so intense that somehow the swinish instinct has become dominant. It hates humanity, and it revels in carnage.
- Henry Gordon Jago: I had the thought of communicating directly with Scotland Yard where, as you know, he's held in the highest esteem.
- Professor Litefoot: The Doctor is?
- Henry Gordon Jago: Oh, yes, of course. It's my opinion he solves half their cases and then lets them take the credit for it. Don't you agree?
- Professor Litefoot: I have no idea.
- Henry Gordon Jago: No, why, it stands to reason. I mean, they're policemen. And we all know, ay, they're solid, sterling fellows, but their buttons are the brightest things about them. Don't you agree?