"Yeah," he says. "We'll need to find a hospital, I think. All out of the nanogenes I kept in the TARDIS before."

As they leave the city, he nods over the horizon. Despite the warmth, the water this time is a bright wintery blue with icy white waves, stark against the black sky. It's almost like seeing a different ocean on a different world.

"Oh, I think I'm better than all right."