The Doctor looks over at the young man when he hears his name. And a small smile appears. Will might have accidentally caused a lot of problems, but he also accidentally solved a few too. Besides, he tried and the young man didn't have a malice bone in his body. Which had always made the Doctor wonder why he would choose UNIT of all places to work...

His Scottish tones are more harsh in this body than Will is probably used to. "I'm one of them... Apparently there are several of us here."

But there is a fondness to his expression. It's good to see a companion who's life he didn't completely screw up. "How are you, Will?"