Board Thread:The Reference Desk/@comment-1292820-20140123070106/@comment-188432-20140124013820

I just checked against a copy of "", in which someone named John Brandon is playing a character called Sgt. Stransky. It's absolutely the same guy who was in The Tenth Planet, episode 1, albeit about 10 years older. Given the fact that IMDb has him also being tons of significant American shows of the 1960s-2000s — from to  he's almost certainly American. So my money's definitely on John Brandon being the first confirmable American in Doctor Who, though there's definitely the possibility that someone before him could have had American citizenship by virtue of parentage or naturalisation or something like that.