Class of the Titans

See You at the Crossroads (1x8)

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When a bad moon rises on All Hallows' Eve, Theresa and the gang find out that Hecate, Queen of the Dead, still has a few tricks up her sleeve. Though Theresa has learned a little magic, Hecate wrote the book on it- like, I mean, what's Theresa supposed to say to stop a legion of zombies?