- Doctor Who: I've never been more serious, Colonel. We are facing an enemy of greater power than you can dream of.
- Skinsale: [Incredulously] I do appreciate the scientific romances of Mr. Wells, but...
- Doctor Who: Herbert may have a few of his important facts wrong, but his basic supposition is sound enough. Do you think your little speck in the galaxy is the only one with intelligent life, hm?
- Leela: [on Adelaide's regular consultation with an astrologer] A waste of time. I too used to believe in magic, but the Doctor has taught me about science. It is better to believe in science.
- Adelaide Lesage: You call yourself a doctor! Well, that's the most insane suggestion I've heard in my life.
- [last lines]
- Doctor Who: Leela, I've made a terrible mistake! I thought I'd locked the enemy out. Instead, I've locked it in... with us!
- Doctor Who: [after Leela smashed the door] The Malicious Damage Act, 1861 covers lighthouses.
- Leela: What?
- Doctor Who: Nothing.