The Doctor makes the fugitive Terileptils a rare offer they shouldn't refuse; but, though few in numbers, they have a plan in the works for the quick and complete domination of Earth and mean to see it through.
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This carnage isn't necessary.
It's survival, Doctor. Just as these primitives kill lesser species to protect themselves, so I kill them.
That's hardly an argument.
It's not supposed to be an argument! It's a statement!