Fenric, The Doctor and others in “The Curse of Fenric”

Kneel if you want the girl to live!

Kill her.

The Time Lord finally understands.

Do you think I didn't know? The chess set in Lady Peinforte's study? I knew.

Earlier than that. Before Cybermen, ever since Ice World, where you first met the girl.

I knew. I knew she carried the evil inside her. Do you think I'd have chosen a social misfit if I hadn't known? She couldn't even pass her chemistry exams at School, and yet she manages to create a time storm in her bedroom. I saw your hand in it from the very beginning.

Ace

[Horrified] Doctor, no.

She's an emotional cripple. I wouldn't waste my time on her, unless I had to use her somehow.

Ace

[Falls to her knees in despair] NO!