Supernatural (TV series)/Recap/S06/E12 Like a Virgin

Season 6, Episode 12:

Like A Virgin
Young women with no apparent connection have been disappearing from the Pacific Northwest; after discovering that all of them are virgins, the brothers conclude that dragons are responsible.

Tropes
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 * Only the Chosen May Wield -- parodied
 * Our Dragons Are Different
 * Record Scratch
 * Take a Third Option -- using explosives to remove the sword from the stone (mostly).
 * Virgin Sacrifice -- opens Purgatory