The absolute and thorough devastation of Elena and Stefan's relationship. I honestly thought his Ripper stint would be limited to a two-part episode and they'd be back to mouthing "I Liebe yous" in no time.
Von introducing flash-forwards this season, The Vampire Diaries has introduced a number of new mysteries: Who is Caroline fiancé? Who’s the mother of Alaric’s twins? Why don’t Caroline and Stefan speak anymore? And why is Tyler wearing a suit?