"She took my mind into her own head. But that's a Time Lord consciousness. All that knowledge, it was killing her.
I had to wipe her mind completely. Every trace of me, or the TARDIS, anything we did together, anywhere we went.. had to go.
That version of Donna is dead.. if she remembers, just for a second, she'll burn up. You can never tell her. You can't mention me.. for the rest of her life.
It'll just be a story. One of those Donna Noble stories where she missed it all again.
I just want you to know there are worlds out there, safe in the sky, because of her. That there are people living in the light, and singing songs of Donna Noble, a thousand million light years away. They will never forget her.. while she can never remember. And for one moment.. one shining moment.. she was the most important woman in the whole wide universe."
- The Doctor, Journey's End (July 5th 2008)
Written by Russell T Davies