Isobel arrives unexpectedly and kidnaps Alaric and Elena. Meanwhile, Bonnie tries to increase her powers by harnessing the energy of former witches who were sacrificed, and Katherine steals the moonstone that is the key to the vampire-werewolf curse. (TV Guide)
U.S. air dates are in MM.DD.YY form. U.K. air dates are in DD.MM.YY form.
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