"It may well be confusing to have a British Doctor and an American Doctor at the same time," she said. "There is only one Doctor, so I don't see that happening."
The thing is, there may have been an American Time Lord on TV, and five years before 'Doctor Who' premiered at that!
I wrote about "The Eddie Albert Show" pilot back in 2005. Here's the basic plot description from IMDb.com: Unsold pilot: In 1958 he made a pilot for an adventure/fantasy series called "The Eddie Albert Show" where he played a reporter searching for amazing stories all over the world, as well as in other times and solar systems.
Nothing's changed since then as to finding out if the pilot was actually made, or only proposed. But wouldn't that have been a cool idea?
The photo of Eddie Albert is taken from the pilot episode of 'Voyage To the Bottom Of The Sea' - "Eleven Days To Zero".