Soooo been looking forward to this thread. The Pertwee era, one era where so much I would love to change.
I have never hidden my contempt for the exile scenario on this forum. Interestingly, on the pamphlet that came with The Colony in Space DVD, it says that Letts and Dicks thought the whole 'ethos' of the show had been compromised by having The Doctor trapped exclusively on Earth and that's exactly how I feel about it. For me, that idea went against everything the show stood for, how it started out and what the show was supposed to be about, which was mainly The Doctor in his TARDIS travelling about in Time and Space with aliens and other planets, providing a escape for 25 minutes(as it was then)
As I said in the Second Doctor Thread, I'd have scrapped the Exile Scenario completely and just have The Doctor's punishment that he wasn't a completely free agent and that he had to do tasks for the Time Lords against his will from the off. That way, the TARDIS would still be seen and used regularly. I would then mix that with stories set on Earth involving UNIT but have The Doctor go off on his travels again at the end, like he did in The Invasion.
I'd also have Liz travel with him in the TARDIS, so would love to see her reaction to the inside of the TARDIS with her Scientific Mind.
Season 7 would also have more stories and less of the tiresome 7 parters. I'd have the friendlier stuff from Season 8 from the off and less of that boring gritty realism that really ruins Season 7. Less of the industrial complexes and boring Earth settings and more spacey adventures. I'd also lose the initial Third Doctor arrogance from this Season as well and indeed, would have added more humour to his Doctor but not so much that we had a similar Doctor in Tom Baker when he arrived.
Also with the Third Doctor, I'd have less of the snorefest moralising that became prominent in his last few Seasons and just approach those sort of issues in a less obvious way to make it seem less as if the show was preaching rather than entertaining, which it certainly did in stories like The Green Death and Invasion Of The Dinosaurs.
Season 8, would like to have seen less of The Master and more use made of previous adversaries. I'd bring back The Daleks a season earlier and use the Cybermen as well so that they also have the record of appearing with every Classic Doctor. Maybe this would have been the right time for the first ever Dalek/Cybermen adventure? All The Dalek stories would be beefed up and improved and Planet Of The Daleks in particular would be a bit more fun than it was.
The rest of the Era I don't have too may alterations to make. Yes, maybe I'd have Pertwee leave at the end of the Tenth Season as well and Sarah could have started off with the Fourth straight away.
As with The Tenth Planet, I'd love to have a fully fit Hartnell in The Three Doctors and see how he got on with his successors in person rather than on the TARDIS Scanner.
There would also be less quarries used as locations as they looked very samey throughout the Pertwee Era.
So there you go, that's how I'd change it. It's probably the Era I'd change more than any other. It has a lot going for it and the stories themselves, with a few exceptions, are never substandard. My issues with the Era are with the format and incumbent himself at times.