[the Terileptil Leader blasts the sonic screwdriver, destroying it]
The Doctor: I feel as though you've just killed an old friend.
Terileptil: It is with some sadness that I tell you you are about to join it.
The Doctor: Why not smile and let me live?
Nyssa: We should wait for the Doctor. We can't take on the android by ourselves.
Adric: Why isn't he here? Why is he never around when you want him?
Richard Mace: I have appeared before some of the most hostile audiences in the world. Today I met Death in a cellar. But I have never been so afraid until I met the man with the scythe.
Terileptil: Your friends are of no interest to me.
The Doctor: Well, that's unfortunate because we had intended to help you.
The Doctor: There are only four of you?
Terileptil: Three, now, but it is enough.
The Doctor: Against the millions who already live on this planet? You'd NEVER establish yourselves here.
Terileptil: You're assuming we plan to coexist.
The Doctor: I've never been able to reconcile the Terileptil's love of art and beauty with their love of war.
Terileptil: War is honourable, Doctor. Even on this planet it is considered so.
The Doctor: Oh, I know - but, by your own admission, these people are still primitive. What's your excuse?
The Doctor: This carnage isn't necessary.
Terileptil: It's survival, Doctor. Just as these primitives kill lesser species to protect themselves, so I kill them.
The Doctor: That's hardly an argument.
Terileptil: It's not supposed to be an argument! It's a statement!