Harrison Chase and Sarah in “The Seeds of Doom”

The sergeant's no longer with us. He's in the garden. He's part of the garden.

Sarah

That's very clever of you.

Don't humour me, Miss Smith. We're helping the plant world, the sergeant and I. In different ways, of course. I've become part of a life that I've always admired for its beauty, colours, sensitivity. I have the Krynoid to thank, as it thanks me for its opportunity to exist here on Earth. Soon the Krynoids will dominate everywhere, and your foul species will disappear.

Sarah

And you'll all flower happily ever after.

You and your kind are nothing but parasites. You're dependant upon us for the air you breathe, and the food you eat. We have only one use for you...