DOCTOR: I had to wipe her mind completely. Every trace of me, or the TARDIS, anything we did together, anywhere we went, had to go.

WILF: All those wonderful things she did.

DOCTOR: I know. But that version of Donna is dead. Because if she remembers, just for a second, she'll burn up. You can never tell her. You can't mention me or any of it for the rest of her life.

SYLVIA: But the whole world's talking about it. We travelled across space.

DOCTOR: It'll just be a story. One of those Donna Noble stories, where she missed it all again.

WILF: But she was better with you.