I dunno, an old lady calling Matt Smith "Grandfather" seems a decent hook for showing that Time Lord Biology Is Weird. Plus, there's no real reason that they couldn't just regenerate her into a twentysomething Susan II. 

Web Planet! It's both over-ambitious and shoddy!
Dominators! Cower in fear of the new baddies, the terrifying QUARKS!
Inferno! Guess who, according to the New Adventures, the guy in charge of the Evil Universe REALLY is!
Pyramids of Mars! The best Voice of an Evil Guy Sitting in a CHAIR!
The Visitation! John Nathan-Turner…

Web Planet! It's both over-ambitious and shoddy!
Dominators! Cower in fear of the new baddies, the terrifying QUARKS!
Inferno! Guess who, according to the New Adventures, the guy in charge of the Evil Universe REALLY is!
Pyramids of Mars! The best Voice of an Evil Guy Sitting in a CHAIR!
The Visitation! John Nathan-Turner…

Well, the semi-obvious explanation for why Susan would be still in her first body is that she's led a much less danger-prone life than the Doctor. Regeneration is supposed to be "live a few hundred years fiddling with Temporal Catalouging or whatever on Gallifrey, trade in for a new body (perhaps one of your choice)…

Well, the semi-obvious explanation for why Susan would be still in her first body is that she's led a much less danger-prone life than the Doctor. Regeneration is supposed to be "live a few hundred years fiddling with Temporal Catalouging or whatever on Gallifrey, trade in for a new body (perhaps one of your choice)…

Off spending a weekend in Vegas with the Jolly Green Giant.

Off spending a weekend in Vegas with the Jolly Green Giant.

The fact that we'll never get a toy HMER is a shame. Such a wonderfully over-armed giant battle robot.

The fact that we'll never get a toy HMER is a shame. Such a wonderfully over-armed giant battle robot.

They should just pack up and move in with the Ice Warriors. Sol-originated pre-human high-tech lizard person solidarity!

They should just pack up and move in with the Ice Warriors. Sol-originated pre-human high-tech lizard person solidarity!

Yes, Web Planet is awesome.You can really tell they're reaching for the stars in it, but unfortunately 1965 BBC technology wasn't able to grab any of them. And the results of that failure are so fascinating. Plus, 6 episodes of people dancing around in bug costumes.

Yes, Web Planet is awesome.You can really tell they're reaching for the stars in it, but unfortunately 1965 BBC technology wasn't able to grab any of them. And the results of that failure are so fascinating. Plus, 6 episodes of people dancing around in bug costumes.

Best blink-and-you'll-miss-it nerd joke of the night: Li'l Hubert's Transformers blanket.

Best blink-and-you'll-miss-it nerd joke of the night: Li'l Hubert's Transformers blanket.

Oh, and maybe Dr. Who and the Daleks and/or Daleks - Invasion Earth 2150 A.D. Dig those groovy Daleks on the big screen, man.

The next Hartnell story should totally be The Web Planet. It's a fascinating study in just how high-concept the early years could get and just how low-execution they usually ended up. Plus, six episodes of people dancing around in bug costumes.

What does the Doctor know?
So how much of the whole "You sent us letters inviting us to see Future You get killed and then invited yourself to go solve it and we can't tell you about it because it's your future so now we're going to be kind of awkward around you" thing has the Doctor worked out yet?

Jeff doesn't want to be a better person. He wants to learn how to look like he's a better person, so he can abuse it.