"A hell dimension?" Martha repeated, quizzically. She'd heard of parallel universes, of course, but that was a phrase that she'd only picked up in Taxon. "Do you know Lorne?"

Because the population of Taxon wasn't that large and a few people seemed to have universes in common.

"That's me," she said, cheerfully. "London in the 21st century. And I know what you mean about getting back. I ... traveled, for a long time. Sometimes it takes you a while to remember where home is."

And the people who needed you.