- The Doctor: Every great decision creates ripples, like a huge boulder dropped in a lake. The ripples merge, rebound off the banks in unforeseeable ways. The heavier the decision, the larger the waves, the more uncertain the consequences.
- John: Life's like that. Best thing is just to get on with it.
- Ace: Doctor, where are you going?
- The Doctor: To bury the past.
- Ace: I'm coming with you.
- The Doctor: It is not your past. You haven't been born yet.
- The Doctor: [seeing the Headmaster doubled up on the floor, whom Ace slugged] What's wrong with him?
- Ace: Stomach ache.
- The Doctor: [as if to explain it] School dinners.
- Dalek: Small human female sighted on level 3.
- Ace: Who are you calling "small"?
- [Ace begins to destroy it with her baseball bat]
- Dalek: Under attack! Under attack! Vision impaired! Reinforcements requested!
- Dalek: Stay where you are! Do not move!
- [Three Daleks close in on Ace]
- Daleks: Exterminate! Exterminate! Exterminate! Exterminate! Exterminate! Exterminate! Exterminate! Exterminate!
- BBC announcer: This is BBC Television. The time is a quarter past five, and Saturday viewing continues with an adventure in the new science fiction series, Doc...