Happy birthday, Buffy!

Yes, it's time to feel really old, because today Buffy the Vampire Slayer (the TV show, as the movie obviously doesn't count) turns 20-years-old.

Though still not old enough to drink in the United States, it's nonetheless surprising to find that Buffy first aired two decades ago.

The outfits may have aged hilariously, but the rest of the series holds up as well as ever, and remains a major part of pop-culture lexicon and an inspiration for generations of shows since.

It remains the best work any of the cast have done, and despite Firefly, Angel, and The Avengers all coming after, it still stands as Joss Whedon's magnum opus.

Given the milestone, it feels an appropriate time to go back in time and look over each of the seven seasons the show offered between 1997-2003. During that time the show became a TV phenomenon, a landmark high school series, a high entry point into the vampire genre, and simply put one of the greatest TV shows of all time.

Now, there isn't an outright bad season of Buffy, but not all seasons are created equally. Instead, they go from good, but with a lot of issues, to utterly incredible.