Re: 5x10 Vincent and the Doctor (Grading/Discussion) SPOILERS!!
(how did Captain Jack survive the trip).
Well, technically he didn't, he was revived soon after the Doctor and Martha landed. But the guy's effectively immortal and in the same episode, we saw him unbothered by radiation that vaporized a poor fella.
And Jack's the only one in the show's history thus far to "survive" a trip in the time vortex unaided.
"A life is like a garden. Perfect moments can be had, but not preserved, except in memory. LLAP" -- Leonard Nimoy