'The Vampire Diaries' new promo: Stefan's got a plan to save Elena and kill Katherine at the same time

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Thanks to Caroline and Stefan's sleuthing on "The Vampire Diaries," they now know that they've been dealing with Katherine this whole time, not Elena. And that's not a good sign for dear old Kat, because Stefan's got a plan to save Elena and kill Katherine at the same time. 

Remember that Traveler knife that Kat used to kill her daughter Nadia's boyfriend who was inhabiting Matt? That's going to come back into play, because all our Mystic Falls bunch has to do is stick Kat with the pointy end of that magical knife, and boom: Kat's dead for good, and Elena has control over her own body again. Smart, and sounds easy enough, right? 

Seeing as how this is "the elusive Katherine Pierce" we're talking about, we doubt it's going to be smooth sailing trying to kill her. Especially since Nadia tips her off that her secret is out, so she's going to be on her guard, and will do anything to save her own life. But what about saving Nadia's life? She was bit by Tyler in the last episode, and she's not looking so good in the new promo The CW just released for the next new episode, "Gone Girl."

Is Katherine going to lose everything -- her daughter, her shot at love with Stefan and her life? Watch the new promo below:

"The Vampire Diaries" airs Thursdays at 8 p.m. ET on The CW.

Photo/Video credit: The CW