She helped them defeat the banshee haunting her home.
Springfield rocked a guitar in his multi-episode arc, parodying himself as a washed-up star reuniting his band Ladyheart.
(That’s when we learnedJensen Ackles' Dean is not a fan of ’80s hair metal.)

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(Why are ghosts afraid of salt?)
Julie Benz as Layla Rourke
Benzwas the firstBuffyveteran to appear onSupernatural.
She played a Leshii, a shape-shifting god that takes on the form of any object of worship.

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Naturally, the brothers got stuck in the middle.
When she was proven right and the Winchesters saved her life she let them go.
“Did she look familiar to you?”

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“For some reason, I could really go for some pea soup.”
Mercedes McNab as Lucy
Poor, doomed Lucy.
Nicole “Snooki” Polizzi as Demon
“What’s aSnooki?”

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asked Sam in season 6.
TheMTVreality star nonchalantly appeared after the boys summonsed a crossroads demon.
Actually, she said, “It’s Nicole now.”

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Jack Rowand/The CW

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