It's been a long, long time since pre-Russell Davies Doctor Who was shown in America, but that's set to change this Sunday, at 9 p.m. EST. BBC America will air the four-part serial "The Aztecs," starring William Hartnell as the First Doctor, in its entirety. It's part of a series titled "The Doctors Revisited," which will help celebrate Doctor Who's 50th anniversary in America by airing a Who serial each month, one per Doctor, in numerical order. Given how well the new-Who series do on BBC America, these classic episodes could be quite the hit... or at least help bring some newer fans into the vast if lower-production-valued world of classic Doctor Who. Thanks to everyone who sent in the tip.