nicely edited by Brian Rimmer, which cuts together all the regeneration scenes — minus the nonexistent Paul McGann to Christopher Eccleston one — and then shares with us the second of his “universal theories” of Doctor Who:
There are two Doctors. The Eighth Doctor is still out there. Somewhere.
I’m not quite sure how Stuart comes to that conclusion: just because we didn’t see the regeneration doesn’t mean it didn’t happen. On the other hand, in one sense, all the Doctors are “still out there” because we could always return to their regenerations for more of their adventures that we haven’t previously been privy to.