WATCH: Kate Nash performs 'Buffy's' 'Once More, with Feeling'

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Written and directed by nerd icon, Joss Whedon, a risky all-musical episode of "Buffy the Vampire Slayer" became one of the cult show's most revered moments in the seven-season series. Sarah Michelle Gellar's Buffy and the rest of the Scooby Gang sang with their real voices in "Once More, with Feeling," while its pluck and playfulness made it a hit with fans and critics alike.

In a special Halloween show at the Hackney Picture House in London, singer-songwriter Kate Nash (sporting a blond Buffy wig) flew her nerd flag high, performing all the songs from "Once More, with Feeling," including "Buffy's" raucous opening theme song.

Check out Nash's self-described favorite, "Walk Through The Fire," below, which performs with a stand-in Spike, Willow and Giles.

Head over to Bleeding Cool for the whole show.