How can one sci-fi show from the late '90s about girl who kills vampires for a living still be thought of so fondly 20 years after it first aired? It's all about its humanity.

It was always difficult to explain to people growing up why Buffy the Vampire Slayer was my favourite TV show. On the surface, Buffy looks like a silly horror show about a high-schooler killing vampires and demons. Buffy Summers, the 16-year-old "chosen one", is a twist on the idea that the blonde girl is always the victim in these shows. Buffy and the "Scooby Gang" fight vampires and stop the end of the world. But beneath the surface it had some of the smartest plot lines, nuanced characters, unique presentation and wittiest dialogue of any TV show ever mad.