Disclaimer: I do not own Doctor Who, Stargate SG1, or Macgyver. If I did, the Daleks would be doing the Macarena, the Cybermen would be sitting in the time out corner, and Ba'al would be in a straight jacket.
Prologue
The Doctor had finally had enough of running, as he'd told the Brigadier. "I'm tired of all the death, of running. Sick of losing people," to be specific. "For once, I need to stop. I didn't after the Time War, should have, but didn't, and now, losing Rose, I can't take it anymore." Death was quite out of the list of options, the Doctor being the Last of the Time Lords, and so was the Chameleon Arch, that being filled with holes in the programming.
"I'm going to take on a human life" the Doctor told the Brigadier.
"You're what!"
"Become a human-name, home, work, so on and so forth. Living in a house, a mortgage, the works. Everything except the biology. Can't get how you get around with only one heart."
"Are you sure, Doctor? You are the last person I'd expect…" the Brigadier hesitated.
"Alistor, please….I could do this without your help, but I would like it. I really am tired of running, and this is a way of saying the goodbye to Rose that I was never able to finish." the Doctor ran a hand over his tired features.
"If I must, and if you stay in contact, Doctor." Alistor said disapprovingly.
"That would be the reason I'm asking for your help, old friend," the Doctor said with a wry smile.
"Have you thought of names or professions?"
"I have, actually. Dr. Angus MacGyver, resident of Minnesota, America. Doctorates in chemistry, physics, and knows a good amount of languages."
"Sounds like you. Gonna be blowing things up?"
"Oh, you wound me," the Doctor put a hand over his chest in mock hurt.
"If I didn't know better, I would say you're a child, Doctor. Alright, I'll help you."
And so the Doctor, Last of the Time Lords, Oncoming Storm, became Dr. A. MacGyver, human genius.