Ex marks the spot for Elena Gilbert at the moment.

Yes, she's happily in love with Damon, as she made clear toward the end of this week's "True Lies," but she also can't stop thinking about Stefan.

And it's clear, based on the following clip, that Elena's subconscious somehow remains tied to this second Salvatore brother, who is now free from his safe and ready to feed like The Ripper once again. Watch a sneak peek at Thursday's "Original Sin" now:

Elsewhere on this Vampire Diaries Season 5 installment, look for Janina Gavankar to guest star as Tessa, a mysterious woman from Stefan's past, and for Silas to reveal the reason why he's after Katherine.

We can't wait.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.