Doctor Who's "Lucky Day" Quietly Revived The First Villain Tom Baker's Fourth Doctor Ever Faced

Doctor Who's rich history frequently comes back to haunt the Doctor and his companions with callbacks to the classic era, as seen in the latest episode with Think_Tank. Doctor Who originally began airing back in 1963, which gives the show the unique privilege of being the longest-running sci-fi series of all time. Of course, the show has changed over the years, with long hiatus', reboots, and significant changes in tone, but along the way, the hero and his mode of transport at the center of it all have remained the same old Doctor and his TARDIS.