He nods. "Chameleon Arch. It can rewrite my biology. Change every single cell of my body into another species. I have it set to human." He digs around in a small box attached to the underside of the panel and pulls out a fob watch with Gallifreyan script etched on the outside. He slots this into a depression on the back of the headset.

"The watch will hold all of the Time Lord part of me. As long as it's closed, the Aubertines can't sense it. Now, I already have something of a past programmed in as a contingency, but it doesn't include anyone else. So, we need to decide how to fit you into it, and I need to quickly reprogram the arch before starting it."