I was thinking about the upcoming Doctor Who 50th Anniversary, and how they might have brought back earlier incarnations of the Doctor if they wanted. I'm sure they'd never do it, but if they wanted to recast, which actors might be a good pick, once they add on a wig and costume?
Here's my list:
David Bradley seems to be ideally suited as William Hartnell. I look forward to seeing his performance in the Special. I am not too familiar with the First Doctor, though, so really you could play fast and loose and I wouldn't notice.
Jason Isaacs may seem an unusual choice for the Second Doctor, but his resemblance to a younger Patrick Troughton is undeniable, so I think if he pretended to be shorter and had a bowl-cut wig, he'd do a fantastic job.
Jon Pertwee is a hard actor to find a double for. The best I could find was Geoffrey Rush, and it's a bit tenuous, but I figure if he had the shock of white hair and frilly sleeved velvet jacket the resemblance would be enough. He has certainly established himself as a great mimic, so can portray Pertwee's mannerisms with aplomb.
Now this is a very strange choice. Our memory of the Fourth Doctor is of a tall hulking man, with a rictus grin and crazy eyes, a huge fright wig of curly hair, a brimmed hat, and a long scarf. But Tom Baker was not as fat a man as he later became. Frank Woodley, an Australian comedian, is quite a thin lanky man, but is equally tall, has a manic look, and something of a resemblance to Tom Baker. If he put on weight, or at least a muscle suit, the other accoutrements would be enough to paint a convincing similarity.
A youthful blonde cricketer is just about all you need to get a decent resemblance to the Fifth Doctor. All Dan Stevens needs is the floppy hair and I think it'd be a successful transformation.
I struggled with the Sixth Doctor. Colin Baker has a very square head, dominated by his curly blond locks and his garish costume, and there aren't too many actors around that have that face shape. Mark Gatiss, creator of the aforementioned 50th Anniversary Special, and also co-creator and actor in Sherlock, and a regular writer for the current series of Doctor Who itself, is I think a close enough match to work just fine.
Sylvester McCoy got his start as a Music Hall performer, a comedian first and an actor second, and it's still deeply a part of his real world character even now, so what you need is someone with a similar sense of self but with a bird-like face and mannerisms. Milton Jones has a reasonable physical resemblance, but more importantly has a similar character in his comedy performances which makes him a good choice.
What do you think?