Spoiler! Vampire Diaries Extended Promo For Season 4, Episode 6: "We All Go a Little Mad Sometimes" — Katherine's Back! Tweet November 9, 2012 at 05:00AM EST by Wetpaint Entertainment Staff Related: The Vampire Diaries, Spoilers , Sneak Peeks , Elena Gilbert , Katherine Pierce , Season 4 Episode 6 Credit: YouTube Katherine (Nina Dobrev) is back in Vampire Diaries Seaso 4, Episode 6, "We All Go a Little Mad Sometimes." Or is it all in Elena's (Nina Dobrev) head?
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