[i]John Smith?[/i]  The Doctor shot the bow tie clad man a look that said he didn't believe that at all, and ducked past him to see the other TARDIS.
"Is that supposed to be a question or an answer?"  Before Donna could say any more, the Doctor called back to her.
"More important problem right now, Donna."  He turned from his inspection of the console to [i]John Smith.[/i]  "How did my TARDIS land in another TARDIS?  One, I'm the last Time Lord, B, I wasn't aiming to land here, and C, or 3, we have a guest from the past."