- Jo Grant: Those things that attacked us. You said you'd seen something like it before.
- Doctor Who: Something very similar, certainly. They emerged from some caves in Derbyshire.
- Jo Grant: The Silurians, wasn't it? The Brigadier was telling me.
- Doctor Who: That's a complete misnomer. The chap who discovered them must have got the period wrong. No, properly speaking, they should have been called the Eocenes.