Say what you will, but Moffat sure can write a banger. This is an iconic story for so many reasons. The titular “Empty Child” was nightmare fuel for many a child following their first viewing—me included. And of course, we are introduced to the notoriously flirtatious Captain Jack Harkness. The Doctor and Rose are split up, Rose being rescued by Jack and subsequently fancying him as she tries to figure out what he’s doing in the Blitz while the Doctor starts to solve the mystery behind the iconic gas-masked child with sparing information from the stubbornly independent Nancy. The story is so well written, balancing the tension of the horror aspects with the strong personalities of all the characters.