The Vampire Diaries will air "The Walking Dead" this week.

But in the first clip from this Thursday's penultimate episode of Season 4, viewers will be treated to a glimpse of the hunting undead, as Caroline and Stefan wander around in search of Bonnie.

How come? Because she's about to lift a certain veil and unleash holy terror on Mystic Falls and the rest of the world, that's why.

Watch now as these two friends trek through high school a few days prior to graduation and find themselves in the "center of the triangle." What might that mean? We shudder to think...

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