It's all AU.

"Hello. My name is Fox Mulder, and before I sit down here I need to know if you are human or alien and if you are armed." Well. It was worth knowing before he got comfortable with his coffee and donut.

She wandered up to the Doctor. Literally poked him. "How do I tell if I know you then, without asking a bunch of questions? Oh, well. I'm Donna Noble. Do you know me?"

After leaving Jack, Theta had wandered around, getting to know the city and being a little bit in awe of the blue, blue sky.

He had a lolly in his mouth, that he damn near choked on when he looked down from the sky and saw Koschei. At the right age, his age. He gagged on the lolly, then dropped it, and ran for him, half leaping onto him.