| Timeline for 3309 |
By 3309, as observed by Professor Egen (a time traveller come from 1959), most traces of human civilisation had disappeared from the Earth. He speculated that humanity had collectively moved on to colonise the stars by this point, but his observation during his next stop, 3359, that there did remain human beings on Earth, who had simply devolved back into cavemen, made this supposition somewhat dubious. (COMIC: Dr. Who's Time Tales)