He reached out his hand, and he could almost swear he felt the warmth of Donna's body heat in the cold Tower's air.

"Doctor, you have to turn back. It's too late for me, turn back!"

Even her eyes. The way they looked equally terrified and determined, that was so very, very Donna. A part of his mind wanted to believe. He wanted to believe that somehow they'd pulled Donna from a period before she forgot, that she was there and real. But Jack was right. It wasn't her.

"Donna forgot me," he said. "She forgot everything. So she couldn't be standing there, no. You're right."