- The Doctor: Homo sapiens! What an inventive, invincible species! It's only been a few million years since they crawled up out of the mud and learned to walk. Puny, defenseless bipeds. They've survived flood, famine and plague. They've survived cosmic wars and holocausts. And now, here they are, out among the stars, waiting to begin a new life. Ready to outsit eternity. They're indomitable... indomitable.
- Harry Sullivan: She's coming round. Steady, steady on, old girl, steady on.
- Sarah Jane Smith: [dazed] Harry?
- Harry Sullivan: Yes, I'm here, I'm here.
- Sarah Jane Smith: Call me old girl again... and I'll spit in your eye.
- Doctor Who: You haven't touched anything, have you, Harry?
- Harry Sullivan: Me?
- Doctor Who: Well, there *are* only two of us here, and your name *is* Harry... .