The BBC America Doctor Who marathon continues today, with Season 8 occupying the morning and afternoon until 3 p.m. ET. That’s when BBC America repeats David Tennant in The Christmas Invasion, voted by fans on the BBC America website as their favorite Doctor Who Christmas special. And following that, it’s a random sampler of some of the series’ very best episodes. Lots of Doctors today, making lots of house calls – at least on TV.