Note: Geoffrey Bayldon's version of the Doctor had previously appeared in the first of the Doctor Who Unbound series, Auld Mortality.
What if... the Doctor really had changed History, even just the tiniest bit?
1480: Leonardo da Vinci visits the stars.
1508: Vasco da Gama sets foot on Mars.
1585: Francis Drake begins charting the Asteroid Belt.
1588: Earth is destroyed by a storm of angels.
The Doctor was really enjoying his freedom. But now there's a Temporal Agent on his tail. Gloriana and the President of Gallifrey are not amused. And Susan's none too well either.
Possibilities, like the Doctor, have a habit of running away with themselves. But who cares, when the jewels are so dazzling...