He frowns at Jack. "While inside the TARDIS, yes. Outside it, it's pretty much my screwdriver, my cleverness, and possibly my stun gun if I can find where Rose hid it after I stunned myself accidentally." He smacks his forehead. "Oh, bollocks, this TARDIS has to be kept out of his hands. It's got our DNA wound into it. If he did anything to her, it could affect us, as well."
"Right, Ianto. Who knows who else it could be drawing here? Any other odd people or sightings?" He cringes at the thought of a Cyberman or Dalek showing up unannounced, but there are also plenty of regular humans or slightly less harmful aliens out there connected to them all in some way.