MAITLAND: Doctor, is there no way you can get into your ship?

DOCTOR: No, not unless they return what they stole from my ship.

RICHMOND: But will they'll never give it back to you!

DOCTOR: Oh my dear, they're not invincible, no-no-no. Did any of you notice the peculiarity in their eyes?

MAITLAND: No I can't say I did.

DOCTOR: It's a fallacy of course that cats can see in the dark, they can't; but they can see better than we humans because the iris of their eyes dilates at night. Yes...huh! Haha!