Today, season finales of science fiction shows are almost always epic. From massive space fleets in various Star Trek season finales, to the big blow-outs in season finales in Foundation, even the most subtle sci-fi shows like to go big at the end. And, in the 21st century, one show that set the standard for massive and epic season finales is the one show that didn’t actually need to go big at all. This creates a massively impossible choice for the Doctor: he has to annihilate all the humans on Earth to stop the Daleks, too. Today, because of the massive popularity of David Tennant’s 10th Doctor, this episode is arguably famous for the wrong thing.