Buffy the Vampire Slayer: Doppelgangland on AllMovie

Angry over being human and still only in the 12th grade, Anya (Emma Caulfield) enlists Willow (Alyson Hannigan) to help her get her amulet back. Their spell goes wrong, and, instead of the amulet, brings vampire Willow back (see "The Wish"). Soon, vamp Willow recruits some vampire henchmen, takes over the Bronze and generally sullies the real Willow's nice-girl reputation. Real Willow confronts vamp Willow in the library -- are they attracted to each other? -- and manages to lock her in the book cage. She trades outfits with her vampire self and goes to the Bronze to kick some pasty vampire butt. Later in the library, Cordelia (Charisma Carpenter), mistaking vamp Willow for the nice one, lets her out of the book cage, all the while preaching to vamp Willow about stealing boyfriends. Meanwhile, Anya recognizes the real Willow at the Bronze blowing her vampire cover and causing one heck of a barroom brawl.