- K-9: [as Adric enters the Console Room] Halt! Your presence here is unauthorised. Explain.
- Adric: You remember me, K-9? Adric?
- K-9: Immature humanoid. Non-hostile.
- Adric: That's better.
- K-9: Your presence is still unauthorised. Explain.
- Adric: I stowed away.
- K-9: Stowed what away?
- Adric: Myself. I'm a stowaway.
- K-9: Stowaway: one who hides on a ship to obtain free passage.
- Adric: I thought I'd join up with the Doctor and see the Universe.
- Romana: You are incredible.
- Doctor Who: Well, yes, I suppose I am, really. I've never given it much thought.