WALLACE: You mean to say that Eleanor has been telling us the truth all this time? I cannot comprehend this at all.

JOHN: It’s all true. The woman you call Eleanor is my niece, Melanie, who somehow has been thrown back through time. We’re here to take her back.

DOCTOR: But there is a problem.

JOHN: The canister?

DOCTOR: No, Mel herself. She has become Eleanor Hallam, part of your family history.

JOHN: So? Ah, I see what you’re saying.

DOCTOR: Yes, we can’t take Mel back. To leave your history unchanged, we must leave her here, to live out her life as Eleanor Hallam