Katherine Attacks Bonnie in New 'Vampire Diaries' Video
In an extended preview clip, Katherine makes quite the first impression. She introduces herself to Bonnie saying, "We haven't officially met. I'm Katherine," and then grips her by the throat. And that's nothing. Elena comes home to find her uncle/maybe dad John bleeding on the kitchen floor (and missing some fingers) from a stab wound Katherine inflicted.
The Salvatore brothers are well aware that she's back to play games and Katherine even flirtatiously tells Stefan, "There are no rules." Will she manage to lure Stefan away from Elena this season? We see Stefan remembering when he was in love with her over a century ago and Katherine tells him, "You want to know why I'm here, Stefan? I came back for you."